Which atom has two unpaired electrons in the outer valence
shell?
O helium
hydrogen
Oxygen
Olithium
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.
Why is the earth's gravity stronger than the moon's gravity? A:The moon is so far away from earth. B:The earth is more massive than the moon C:The moon has no mass. D:The earth has a larger volume than the moon.
Answer:
A and B
Explanation:
Gravity relies on both mass and distance
The reason the earth's gravity stronger than the moon's gravity is B. The earth is more massive than the moon
How is the earth gravity stronger ?Gravity is a force that attracts two objects with mass towards each other. The more mass an object has, the stronger its gravitational pull.
The distance between two objects also affects the strength of gravity. However, the distance between the Earth and the Moon is not large enough to significantly weaken the Earth's gravitational pull.
The Earth has a mass of about 5.972 × 10^24 kilograms, while the Moon has a mass of about 7.347 × 10^22 kilograms. This means that the Earth's gravity is about 6 times stronger than the Moon's gravity.
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A scientist wants to test whether the pH, salinity, or temperature of seawater impacts coral
development. He sets up an experiment with three conditions:
Aquarium 1: Normal pH, normal salinity, normal temperature
Aquarium 2: High pH, high salinity, high temperature
Aquarium 3: Low pH, low salinity, low temperature
What factor would improve experimental design the most?
Eliminating Aquarium 1 since it only uses normal conditions
Testing one variable at a time and keeping the other two variables constant
Using one aquarium and changing the variables from day to day
Setting up the variables on a gradient in each aquarium
Answer: Testing one variable at a time and keeping the other two variables constant
what plays a key role in stimulating appetite and enabling us to taste food
Answer:
taste bud is the one that stimulate appetite and enable us to taste
Explanation:
because without the taste bud, we won't know that a particular food contain ions, acids and base
If water has a density of 1g/cm3, what must be true about the density of ice
Answer:
Water is more dense than ice, so ice will have lower density that make it float
which two sentencens support the point that both cultures value children
Which statement explains how determining the age of the remains of living things is similar to dating rocks
Answer:
it is choice a.............................
Explanation:
on test
Answer:
A
Explanation:
which of the following is the best explanation of how one organelle and a cell directly supports the work of another organelle to maintain cellular homeostasis
Answer:
All organelles have specific things that they are responsible for, all organelles work together to support the cell to work which maintains homeostasis. Organelles know their jobs and do them right so that the cell can function properly.
Describe the type and ratio of organisms you would expect to find in a lake in a national park. give evidence to support your answer
Answer:
Algae would be the organism in greatest proportion in a lake in a national park.
Explanation:
A lake in a national park would have algae proliferation, which would be the largest organism in that lake. This is because a lake in a national park is subjected to great incidence of sunlight and large amounts of oxygen. This would facilitate and stimulate the reproduction of algae on a large scale, causing them to develop in the substrate, stones, pebbles, and in the water itself.
Evan finds a rock. He scrapes it with his fingernail and leaves a scratch. His rock must be:
O a metamorphic rock
harder than feldspar
softer than diamond
made of more than one mineral
HELLP
The correct answer is C. Softer than diamond
Explanation:
Evan observation is related to the rock's hardness, which is usually measured on a scale from 1 to 10, in which 10 represents the hardest rock (diamond). In the case of the rock Evan found, the fact the rock can be scratched just using a fingernail shows the hardness of this rock is 2.5 or below because only minerals with this hardness can be scratched using the fingernail, while a higher hardness requires more complex tools.
Moreover, in this level of hardness, there are minerals such as gypsum or talc and these are softer than others such as feldspar with a hardness of 6 or diamond with a hardness of 10. In this context, it is safe to conclude this rock is softer than diamond. Also, hardness is not enough to determine if a rock contains two or more minerals or if it is metamorphic.
1. The spinal cord is organized in 35 segments.
o True
O False
All of the following are included in the forebrain except the
A. cerebellum
B. cerebrum
C. thalamus
D. hypothalamus
Please select the best answer from the choices provided
Answer:
D.
hypothalamus
Explanation:
edge
All the structures above indicated are included in the forebrain EXCEPT the CEREBELLUM (Option A).
The forebrain (also known as the prosencephalon) is the largest region of the brain.
The forebrain is composed of the cerebrum (telencephalon), thalamus, hypothalamus, pineal gland and limbic system.
The cerebrum is recognized to be the biggest portion of the brain.
On the other hand, the cerebellum is a brain structure located between the brainstem and the cerebrum.
The functions of the cerebellum include motor abilities, sensory perception and body posture/balance.
In conclusion, all the structures above indicated are included in the forebrain EXCEPT the CEREBELLUM (Option A).
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11- El Pirata Barba Plata ha llegado a la isla del Coral para buscar un
tesoro. En el mapa pone que, desde la orilla, debe recorrer 3,7 hm a la
pata coja hacia el centro de la isla, y después otros 8,5 dam dando
volteretas en la misma dirección. ¿Cuántos metros recorrerá en total
desde la orilla hasta el tesoro? * cuál es la repuesta
Answer:
El pirata recorrerá 455 metros
Explanation:
3,7 hectómetros (hm) = 370 metros (m)
8,5 decámetros (dam) = 85 metros (m)
>> Distancia en metros = 370 m + 85 m = 455 metros
El hectómetro (hm) es una unidad de longitud que equivale a 100 metros, donde el prefijo hecto indica la equivalencia a 100 metros. Por su parte, el decámetro (dam) equivale a 10 metros, donde el prefijo deca indica la equivalencia a 10 metros.
Why do cells have different shapes if most cells have the same organelles?
Answer:
cells have different shapes because they do different things
Explanation:
each cell type has has its own role to play in helping our bodies
to work properly
the wolf population on isle royale fell to just twelve animals after the accidental introduction of canine parvovirus. years later scientists discovered that the skeletons of dead wolves had a high level of deformities in the pelvis and tail bones. how would you explain this finding
Answer:
Genetic drift caused fixation of deleterious alleles that impaired bone development.
Explanation:
With a low population, the effects of parvovirus will have a lasting impact on future generations as the alleles are less likely to be bred out of the population.
Pythagoras's Model has the sun in center of the universe.
True
False
Answer:
i think its false, i checked wikipedia and it says that he thought the sun revolved around a "central fire"
Explanation:
In our neighborhoods we have garbage people that come around and
collect garbage and waste at you home. What does that inside of the cell.
Answer:
The answer is lysosomes
Explanation:
Lysosomes are membrane bound organelles that contain degradative/digestive enzymes which are used to digest/degrade/break down unwanted or worn out cellular organelles through a process known as autophagy.
The reason the answer is lysosomes is because the waste (unwanted or worn out organelles) use to be a useful part of the home (cell), however, there is another organelle responsible for absorbing and neutralizing toxins in the cell; it's called peroxisomes
What is the mean height of the plants given fertilizer?
Answer:
a. 33.5
Explanation:
You find the mean of something by adding all the values and dividing by the number of values you added. In this case I added five values so I divide the total number when adding the values by five.
Answer:
a
Explanation:
33.5
Which observations did Darwin make?
Select the three correct statements.
Each individual frequently and continuously uses the necessary organs.
Heritable variations exist in each population.
All organisms share similar features.
Each species seems suited for its particular environment.
)
A population has more individuals than can be supported by the environment.
The population size suits the resources of the environment.
Answer:
Heritable variations exist in each population.
Each species seems suited for its particular environment.
A population has more individuals than can be supported by the environment.
Explanation:
Answer:
each species
A population has more
Heritable variations
Explanation:
2. The loss of the structure labeled U in the
figure above results in the formation of
what? SC.8.P.8.7
A isotope
B ion
C element
D) atom
Answer:
element
Explanation:
Answer: element
Explanation:
how is sexual reproduction in plants become evolved to become less dependent on water?
Answer:
The Gymnosperms and Angiosperms are groups of plants with seed, which means that they don't necessary acquire water for fertilization. ... The sperm (male gamete) of gymnosperms is enclosed in a pollen grain. Thi structure is protected from desiccation and can reach the female organs without dependence on water.
Explanation:
Which statements describe the energy in a food web? Select three options,
When an organism eats another organism, it loses energy,
Producers have the greatest amount of available energy,
Energy can follow many different paths,
When an organism eats another organism, it gains energy,
Producers have the least amount of available energy,
Energy always follows a single path.
i
Answer:
B, C. D!!!!!!!!!!!!!!
Explanation:
lmk if i said the wrong one!
I will change my answer so no one else gets it wrong :)
Why fatty acids need a protein transporter to move cross membrane?
Answer:
Transport of long-chain fatty ácids across the cell membrane has long been thought to occur by passive diffusion........Fatty ácids transporters hold promise as a future target to rectify lipid fluxes in the body and regain metabolic homeostasis.
Marine crustaceans that are sessile, secrete calcareous plates and filter-feed are:_____.
a. ostracods.
b. barnacles.
c. copepods.
d. decapods.
e. isopods.
Answer:
B. Barnacles
Explanation:
Marine crustaceans that are sessile, secrete calcareous plates and filter-feed are Barnacles. Barnacles are the only sessile crustaceans known in the world.
They are characteristic to marine environments and they are usually found in shallow environments. They are edible due to their relationship with crustaceans such as shrimps etc
benifits of seroranin
Answer:
Serotonin is an important chemical and neurotransmitter in the human body. it is believed to help regulate mood and social behavior, appetite and digestion, sleep, and memory
At which stage of development does the embryo implant in the uterus?
Answer:
Blastocyst stage
Explanation:
A baby undergoes different stages of development before they become fully matured. It all begins with the process of fertilization which involves a sperm cell coming in contact with an egg.
After a successful fertilization, the fertilized egg travels down to the uterus where it undergoes series of cell division till it becomes a stack of arranged cells known as the blastocyst.
During the blastocyst stage, the embryo fastens itself to the edge of the uterus, this process is known as implantation.
Hence, the embryo implants in the uterus during the blastocyst stage.
Help please due tomorrow!!
Answer:
Y- x+ Y-
Explanation:
when an atom loses electrons the atom the result is a positive ion. when an atom gains an electron, the result is a negative ion
What is the most important life processes in cells?
Answer:
oxygen, and glucose
Explanation:
Two of the chemicals and chemical processes that are most important to human life are oxygen, required for cellular respiration, and glucose, a form of sugar that releases energy during cellular respiration.
hope this helps you:)
please help me with this :,,,,,,,,,,,,,)
Answer:
using the formula
v=l*w*h
a. 8cm³ b. 384cm³ c 27cm³ d.75cm³ e200cm³ f 48cm³
g 49cm³ h 96cm³ i 1000cm³
Where in the digestive system do the amounts of glucose, amino acids, and fatty
acids increase?
Answer:
The small intestine hope this was helpful.