Which atom has two unpaired electrons in the outer valence
shell?
O helium
hydrogen
Oxygen
Olithium

Answers

Answer 1

Answer:

Oxygen

Explanation:

The electrons present in an atom are arranged in shells or orbitals. The electrons are filled into these shells based on their energy levels with those shells closest to the nucleus filled first as they have the lowest energies.

The arrangement of electrons around the nucleus of an atom is known as electronic configuration. The outermost electron shell of an atom is known as a valence shell shell and the electrons found in this shell are known as valence electrons. The electrons usually exist in pairs. The first shell can only contain two electrons; the second shell can contain 8. the electrons are singly filled first before pairing occurs.

The electronic configuration of the atoms of the elements in the option are as follows:

Helium : 1s² ; valence electrons are 2 which are both paired

Hydrogen: 1s¹ ; valence electron is 1

Oxygen : 1s²2s²2p⁴ ; valence electrons are 6 wit two unpaired electrons

Lithium : 1s²2s¹ ; valence electron is 1

Helium has two valence electrons but they are paired as its 1s shell can only contain a maximum of two electrons.

Oxygen has 6 valence electrons. Two of these electrons are paired while the other two are unpaired.


Related Questions

Which model represents the Law of Conservation of Mass?​

Answers

theres no picture lol !

The functional connectivity is greatest for which pair of species?
Wood frogs and Spotted salamanders
O Black bears and wood frogs
O White-tailed deer and Pickerel frogs
O Spotted salamanders and Black bears
O Grizzly bears and White-tailed deer​

Answers

Answer:

White-tailed deer and Pickerel frogs

Explanation:

unique physical features of pigeon​

Answers

Answer:

There are many unique physical features that pigeons have.

Explanation:

Pigeons, according to studies, are surprisingly complex creatures. They have passed the "mirror test"(self recognition), can recognize others, and can recognize every letter of the human alphabet.

There are also incredible physical features.

Plumage is one of these. Their plumage varies, and is unique to the type of pigeon they are. Not only this, but they have the ability to walk, while most other birds hop about.

Something absolutely extraordinary about them is that they have a gland in their throat. That gland actually secretes milk for their offspring, so they have adequate nutrition to grow and develop.

Hope this helps.

true or false Geoengineering will have no negative effects on the environment.

Answers

The answer is false

It is false that geoengineering will have no negative effects on the environment.

What is geoengineering ?

Geoengineering, also known as Climate Engineering, is the deliberate, extensive modification of the Earth's environment and climate in order to stop further climate change, halt and stop global warming, and lessen the effects on human society and the ecosystem.

Spraying compounds into the atmosphere to create reflecting aerosols and reflect sunlight into space is known as solar geoengineering. Although this would prevent global temperatures from rising, local or regional temperatures may still rise over the coming years, according to a recent study.

Hence, it is false that geoengineering will have no negative effects on the environment.

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Which type of feed is typically fed to baby chicks?
crumbles
mash
pellets
scratch

Answers

I feed mine a started mix and that usually has pellets in it.

How many neutrons are The process of fusion and fission are completely different. Fusion combines two light atoms together and fission splits the nucleus of a large unstable atom. What is the MAJOR similarity between the two? in the isotope Carbon-14?

Answers

Answer:

Examples of fission and fusion

For example, the so-called hydrogen bomb (or H bomb) is actually a deuterium–tritium bomb (a D–T bomb), which uses a nuclear fission reaction to create the very high temperatures needed to initiate fusion of solid lithium deuteride (6LiD), which releases neutrons that then react with 6Li, producing tritium.

Explanation:

When a liquid changes to a gas the process is called?

Answers

Answer:

Condensation

Explanation:

the word is called condensation

Which of the following is not part of the circulatory system? Group of answer choices Heart lungs Blood Vessels Blood

Answers

Explanation:

Lungs is not a part of circulatory system as it is the part of respiratory system.

what is the amino acid responsible for increasing bone length​

Answers

Answer:

alanine, arginine, glutamic acid, glycine, and proline—may play a role in bone health, principally through improved production of insulin and insulin‐like growth factor 1 and the synthesis of collagen and muscle protein

Explanation:

Bart has to babysit Maggie for several nights in a row during summer vacation and makes a bet with that Taylor Swift music will get Maggie to Bart gets out the CD collection and when Maggie cries the first night, he plays The second time he plays /DC and rocks out, but she doesn't stop crying. The third time he plays Taylor Swift. When he plays Taylor Swift, Maggie immediately and starts to smile. •What is the independent variable? •What is the hypothesis? •What is the dependent variable? •Milhouse says Bart needs to try to see what Maggie will do if he doenst play any music At all. What is this called?

Answers

Answer:

Independent variable: THE TYPE OF MUSIC PLAYED

Dependent variable: MAGGIE'S TEARS

Hypothesis: IF Taylor Swift's music is played, THEN Maggie will stop crying

Control group

Explanation:

The hypothesis of an experiment is a testable explanation given to possibly solve an observed problem. In this question, Maggie thinks Taylor Swift's music will get Maggie to stop crying, hence, one can hypothesize that: IF Taylor Swift's music is played, THEN Maggie will stop crying

Independent variable is the variable that the experimenter manipulates or changes in order to bring about an outcome. The independent variable in this experiment is the THE TYPE OF MUSIC PLAYED by Bart because it is what is changed.

Dependent variable is the variable that is being measured. It responds to the changes made to the independent variable. In this experiment, the dependent variable is MAGGIE'S TEARS.

Milhouse says Bart needs to try to see what Maggie will do if he doenst play any music At all, this is called the CONTROL GROUP because the control group of an experiment is the group that does not receive any experimental treatment i.e. the independent variable is not added.

(MICROSCOPES) "If the total magnification is 40x. The eyepiece is 10x, what is the power of the objective lens?"
PLEASE HELP! ILL GIVE 5 STARS.

Answers

Answer: the answer should be 400x

Explanation: duh

A conveyer belt moves a 40 kg box at a velocity of 2 m/s. What is the kinetic energy of the box while it is on the conveyor belt?

Answers

I have no idea tbh I just want points sorry not sorry

What do you think will be the biggest
space mission of the twenty-first century?

Answers

Answer:

going to all the other plants to try to find life form

Each word describes the creatures in a tropical rainforests, except:
A. Numerous
B. Uniform
C. Biodiverse
D. Adapted

Answers

the answer is B. Uniform

The island of Hawaii experiences volcanism because it is located
O above a hot spot
O above an active mid-oceanic ridge
O along a transform fault
O a site where 2 plates are colliding
above a subduction zone​

Answers

Answer:

Scientists believe that the reason Hawaii has so many volcanoes is because it is located above a hot spot that is suspected to start at earths liquid core.

Explanation:

most embrassing moments do youhave​

Answers

I always trip and fall ao thats pretty embarrassing

Answer:

I was going up on the stairs to my class room , when I fell infront of my class mates.

It was really embarrassing

When someone challenges your opinion, you should ___________________. A. repeat your opinion again until they are convinced. B. acknowledge their opinion and make sure you have a valid argument to respond with. If you do not have a valid argument, you may be in the wrong. C. ignore them, their opinion doesn’t matter when you have already formed your own opinion. D. accept their opinion as correct, especially if they have a degree.

Answers

Answer is b you should go over their opinion and make sure you have enough valid reasons to challenge wether you are right

Opinions are the views formed concerning something. When an opinion is challenged, then one should acknowledge them and ensure that a valid argument is presented in the counterclaim. Thus, option B is correct.

What is a counterclaim?

A counterclaim is a rebuttal made against the claim made previously and is the response of an individual to the presented opinions or judgments. It is generally presented to clear and oppose the ideas claimed by the opposition.

If an idea of a person is challenged then the person can respond by presenting a reasonable argument that can validate the ideas and opinions as true and accurate rather than getting them as incorrect.

If a valid argument is not presented then there might be a possibility that the ideas and opinions presented were not true or correct.

Therefore, one should acknowledge other people's opinions by providing a valid argument.

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Jim wants to study the distribution, movement, and quality of water on Earth. Which field of study does it refer to?
is the scientific study of the distribution, movement and quality of water on Earth

Answers

Answer:

Hydrology

Explanation:

Hydrology is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and environmental watershed sustainability.

A mineral crystallizes from magma deep inside Earth.
Which characteristics can be determined given only the information above?
O luster
streak
O crystal size
O crystal structure

Answers

Answer:

It's crystal size.

Explanation:

The magma in the earth isn't cooling yet, the slower the cooling, the larger the crystals,

Pls, mark brainliest

From the given information the crystal size can be determined. The crystal size can be studies from the crystallization and cooling rate of magma.

What are minerals?

Minerals are inorganic solids that exist in nature and have a distinct chemical composition and crystalline structure. Even though thousands of minerals in the earth have been found, only ten minerals such as  quartz, orthoclase,  pyroxene, calcite, biotite, garnet, clay etc. make up the majority of the crust's volume.

Mineral rock have to property of lustering such as polished metals and they reflect the light in color. The color of the powder of the crystalline mineral is called streak.

As the magma cools, the size of crystal becomes large. It is proved that from the cooling rate of magma, the crystallization and crystal size can be determined.

Hence,  crystal size can be determined from the given information and option C is correct.

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Read this description of the life cycle of a mushroom. 1. A mushroom begins to grow underground as a single-celled "spore.” 2. The spore grows into multicellular structures called "hyphae.” 3. The hyphae absorb nutrition and detect when conditions are right to sprout a mushroom above ground. 4. The sprouted mushroom then forms new spores that can enter the ground and begin the life cycle again. Which sentence about this life cycle shows that mushrooms need energy and respond to stimuli? A: A mushroom begins to grow underground as a single-celled “spore.” B: The spore grows into multicellular structures called “hyphae.” C: The hyphae absorb nutrition and detect when conditions are right to sprout a mushroom above ground. D: The sprouted mushroom then forms new spores that can enter the ground and begin the life cycle again

Answers

Answer:

youranswerisletterbbcauseThesporegrowsintomulticellularstructures calledhyphaemakesthemostsence

Explanation: :D Im Happy to help

Answer:

C

Explanation:

What is a real-life example of genetic drift?

Answers

Here’s an example that I used when I was doing that— “Of the two pink monkeys in the world - one male, one female - the female dies, ensuring that there will never be a pure-bred pink monkey again.”

A real-life example of genetic drift - The Afrikaner (Dutch) population

Genetic driftan unpredictable change in the gene poolit usually limits diversity as some alleles are either eliminated or expressed too much.there are two forms of genetic drift founder effect and bottleneck effectA real-life example of genetic drift is -The Afrikaner (Dutch) population that settled in South Africa had an abnormally high count of Huntington's Diseaseit is due to the first Dutch settlers had a high frequency of the gene than the original population

Learn more:

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Sue has Parkinson's disease. She takes medication that increases the level of

Answers

Answer:

Sue has Parkinson's disease. She takes medication that increases the level of dopamine.

Explanation:

How does genetic variation within a species increase the chance of survival in a species in a changing environment? explain and provide an example

Answers

Let’s take butterflies for an example.
Some butterflies change into different colours depending on the environment.
A tree camouflaged butterfly would not survive in a grass camouflaged butter. The reason they survive is because of genetic variation.

HELP ASAP!!!
Which group of elements are present in all macromolecules in living things? (8.9A)
C, H, P, N
C, H, O
Na, CI, O
OS S. P, C, O

Answers

Answer: the answer is C,H,O

Explanation:Option B is correct

Answer:

c,h ,o

Explanation:

What is the molecular weight of 1 mole of NaCl where the atomic mass of Na = 23 and Cl = 35.4?

Answers

60.4 is the answer I think

Which process connects glycolysis and the citric acid cycle?
A. lactic acid formation
B. acetyl CoA formation
C.electron transport
D. Krebs cycle

Answers

Answer: the answer is B

Explanation: i lied lolololloloolollololol

Why can’t animals be autotroph

Answers

Answer:

They can't get energy or food from the sun. They must hunt for their food.

Explanation:

Most autotrophs make their "food" through photosynthesis using the energy of the sun. Heterotrophs cannot make their own food, so they must eat or absorb it.

Pls need help the question is up there already giving BRAINLEST to a good answer

Answers

Answer:

The last choice. Think of planets, the bigger they are, the stronger they attract to one another

Explanation:

hope it helps

What happens to hydrogen bonds when water turns to ice?

Answers

Answer:

at temperatures low enough to turn off the disruptive effects of thermal motions, water freezes into ice in which the hydrogen bonds form a rigid and stable network.

Explanation:

Notice that the hydrogen bond (shown by the dashed green line) is somewhat longer than the covalent O—H bond.

How are soil and plant taxonomy the same

Answers

They are both used to benefits plants growth process.
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