What is the electron configuration of an element with atomic number 20? A. 1s2 2s2 2p6 3s2 3p5 B. 1s2 2s2 2p6 3s2 3p6 C. 1s2 2s2 2p6 3s2 D. 1s2 2s2 2p6 3s2 3p6 4s2 E. 1s2 2s2 2p6

Answers

Answer 1

Answer:

electron configuration is 2,8,8,2

Explanation:

1s2 2s2 2p6 3s2 3p6 4s2


Related Questions

Two cities have smokestacks on their plants. Which of the following weather conditions would you expect to create an increase in air pollution dispersal for one of the cities?

The city with a higher air pressure
The city with a higher humidity
The city with a lower wind speed
The city with a lower temperature

Answers

Answer:

The city with a higher air pressure

The city with lower wind speed

how did the modern atomic theory develop?

Answers

From Dalton to the Periodic Table. Modern atomic theory begins with the work of John Dalton, published in 1808. ... The best evidence for his theory was the experimentally verified law of simple multiple proportions , which gives a relation between the weights of two elements that combine to form different compounds.

Which structure is most likely used for hunting?

Answers

Answer:

A.claws

Explanation:

A. Claws because it has talons which are sharp and primarily used for grabbing into prey

What’s the importantance of the endosymbiotic

Answers

Endosymbiosis is important because it is a theory that explains the origin of chloroplast and mitochondria. It is also a theory that explains how eukaryotic cells came to be.

Katie wants to see if apples that are kept cold will rot or stay edible. She places an apple in the refrigerator and records the date. What should she use as a control?

(a) Keep an apple in freezer

(b) Keep an apple in boiling water

(c) Keep an apple in cool place

(d) Keep an apple in warm place

Answers

B because it is the opposite of it sitting in the cold

Describe the three steps of the lock and key model of enzyme function.

Answers

The specific action of an enzyme with a single substrate can be explained using a Lock and Key analogy first postulated in 1894 by Emil Fischer. In this analogy, the lock is the enzyme and the key is the substrate. Only the correctly sized key (substrate) fits into the key hole (active site) of the lock (enzyme).

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Which of the following products were created through marine biotechnology?

Penicillin

Plasma television

Fluorescent dyes

Lithium batteries

Answers

Answer:

penicillin is the answer

Penicillin. The first name for Penicillin was “mould juice.” Scottish bacteriologist Alexander Fleming accidentally discovered this said antibiotic in 1928. When he got back from vacation, Fleming found a green mold called Pennicilium notatum that had contaminated some Petri dishes in his lab and were killing some of the bacteria that he had been growing.

A school is planting a new drought-tolerant landscape. To determine which
material will retain the most water, a science class carried out experiments
using different materials. How do we know the results are valid?

Answers

Answer:

the results make sense

Explanation:

if the results weren't valid, it won't make sense

hope it helps

Answer:

c

Explanation:

hopes this helps

Which is an example of a chemical change?

Answers

Answer:

when you put chemicals in water and the water gets chemically changed?

Answer:

burning,cooking,rusting,and rotting.

Explanation:

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.


Atoms have a _______
surrounded by _____

A. positive electron, negative nuclei
B. negative electron, positive nuclei
C. negative nucleus, positive electrons
D. positive nucleus, negative electrons

Answers

Atoms Have A Positive Nucleus, Surrounded By Negative Electrons.

A population contains short plants and tall plants. The short plants are not able to compete with tall plants for sunlight. The tall plants, however, are more susceptible to wind damage. Which type of selection will this population of plants most likely experience? directional selection disruptive selection species selection stabilizing selection

Answers

Answer: D

Explanation: A population contains short plants and tall plants. The short plants are not able to compete with tall plants for sunlight. The tall plants, however, are more susceptible to wind damage.

Which type of selection are the plants experiencing?

directional selection

disruptive selection

If tall and small plants coexist in a population. Short plants are unable to compete for sunlight with tall plants. However, tall plants are more vulnerable to wind damage, it experiences stabilizing selection, hence option D is correct.

What is stabilizing selection?

A form of natural selection when genetic diversity declines as a population stabilizes on a given trait value.

Disruptive selection's opposite is stabilizing selection. It favors the intermediate variants rather than people with extreme traits.

The more severe phenotypes are typically eliminated through stabilizing selection, which leads to the reproductive success of the average or typical phenotypes.

Therefore, stabilizing selection this population of plants most likely experience.

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How does studying the cell help you better understand God’s creation?

Answers

Answer:

studying the cell helps you see how god has made thing unique

Explanation:

so see the bacics the animal is made by god and you can see the different features that god has put into the cells to help then survive hope this helps you rate 5 star and a thanks if it did

studying the cell helps you see how much time god took on every human being by being very specific with what is in the cell whether it is a healthy or unhealthy cell

If a horse and zebra breed to produce a sterile horse.____
means that one is
incapable of producing fertile offspring. In other words, their offspring cannot breed.
Describe biogeographic isolation?

Answers

Answer:

Biogeographic isolation is the separation of organisms of a species through geographical or biological forces.

Explanation:

*ANSWER PLS N TY* How does water scarcity in certain places result in hunger for the people? a.) Water is needed for proper sanitation. b.) When wetlands dry up, more biodiversity occurs. c.) Polluted water causes disease. d.) Water is needed to grow successful crops.

Answers

Answer: D water is needed to grow successful crops

Answer:D

Explanation: Crops need water for transpiration and evaporation. The plant roots suck or extract water from the soil to live and grow, without this crops won’t successfully grow. This should help :)

In a new trial to test the effectiveness for a new type of medicine, why is it necessary for one group to receive a placebo?

Answers

Answer:

To serve as control experiment.

Explanation:

Hope it helps.

It is necessary in order to have a control group.
Explanation:
By having a placebo group one can observe whether or not the one with the new type of medicine have any consistent and real changes after taking the medicine.

During the Calvin Cycle of photosynthesis, stored energy is used to convert CO2 into ______, which is converted into _______.

Answers

Answer:

convert CO2 into sugar which is converted into glucose

Explanation:

Check
Match each type of fossil to its description
petrified fossil
X
hollow form
mold
solid copy
carbon film
living thing turned to rock
cast
X
record of an organism's activity
trace fossil
detail left after an organism decays

Answers

Answer:

mold - hollow form

carbon film - detail left after an organisms decay

living things turned to rock - petrified fossil

trace fossil - a record of an organisms activity

cast - solid copy

Two trees have the same girth but different heights. The volume of the shorter tree is estimated to be 142 cubic feet.
How can you use Cavalieri's Principle to find the volume of the second tree?

Answers

Answer:

im pretty sure the volume would be equal

Which statement best describes the difference between vascular plants and
nonvascular plants?
O A. Vascular plants reproduce with seeds, and nonvascular plants do
not.
O B. Vascular plants reproduce with spores, and nonvascular plants do
not.
C. Vascular plants have vessels, and nonvascular plants do not.
O D. Vascular plants have flowers, and nonvascular plants do not.
SUBMIT​

Answers

The correct option is A. Vascular plants reproduce with seeds, and nonvascular plants do not.

The following information should be considered:

A vascular plant contains vascular vessels to carry water and food to all the different parts of the plant. While on the other hand, Nonvascular plants are most commonly found in moist environments, which assured they get sufficient water without relying on roots.

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Which include the male and female sex cells?
gametes
chromosomes
eukaryotes
diploids

Answers

i think the answer is gametes

Answer:

gametes

Explanation:

which molecule loses electrons during cellular respiration?

Answers

Answer:

glucose

Explanation:

Who first identified nucleic acids, and where were they discovered? Friedrich Meischer discovered nucleic acids in blood cells. Phoebus Levine discovered nucleic acids in plant cells. James Watson and Francis Crick discovered nucleic acids in DNA. Gerardus Johannes Mulder discovered nucleic acids in bacterial cells.

Answers

Answer:

Friedrich Miescher discovered nucleic acids in blood cells.

Nuclein was discovered by Friedrich Miescher in 1869

Explanation

In the somewhat early 1880s Albert Kossel further purified the substance and discovered its highly acidic properties. Then he later discovered the nucleobases. In 1889 Richard Altman creates the term nucleic acid. Friedrich Miescher was the first scientist to ever isolate nucleic acid.

Friedrich Meischer was the first who discovered nucleic acids in blood cells. The correct option is A.

Who was Friedrich Meischer?

Miescher, Johannes Friedrich, was indeed a Swiss physician and biologist. In 1869, he became the very first researcher to extract nucleic acid.

He also discovered protamine and managed to make several other discoveries.

In the winter of 1868 the adolescent Swiss physician Friedrich Miescher carried out experiments on the chemical composition of leukocytes in the research lab of Felix Hoppe-Seyler at the University of Tubingen, which resulted in the discovery of DNA.

Thus, the correct option is A.

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Which base is found only in DNA?
adenine
O guanine
o cytosine
thymine

Answers

Answer:

DNA: adenine (A), thymine (T), cytosine (C

), and guanine

But thymine is only found in dna

and it is replaced by uracil in the rna

Thymine, in rna it is replaced

What is the main term used to locate COPD in the alphabetic index

Answers

Answer:

Chronic obstructive pulmonary disease

Explanation:

I'm not 100%  sure of what you're asking here but the main term for COPD is Chronic obstructive pulmonary disease. COPD is a long-term lung disease, which makes breathing especially difficult. I hope this helps:)

All wetlands are considered freshwater ecosystem

Answers

Answer:

Marshes, swamps, and bogs are all considered wetlands. ... Wetlands are not considered freshwater ecosystems as there are some, such as salt marshes, that have high salt concentrations—these support different species of animals, such as shrimp, shellfish, and various grasses.

Explanation:

i hope this helps you!

Answer:

It will be false

Explanation:

Took on edg

Which option identifies one section of the ocean floor?
intertidal zone
open ocean
neritic zone
transition zone

HELP

Answers

Answer:

c. neritic zone

A seabed or the ocean floor is the underwater structure that lies on the bottom of the ocean or sea. The oceanic floor comprises continental inclines and elevations, mid-ocean ridges, trenches etc.

The correct answer is:

Option C. Neritic zone.

This can be explained as:

The shallow region of the ocean is called the neritic zone that extends up to 660 feet of depths.

The sunlight is available and plankton's and other organisms can make their food.

It is the most prolific zone of the ocean because of the abundance of nutrients.

Organisms like sea anemones, crabs, sponges, dolphins, jellyfish etc. prevail in this zone.

Therefore, the neritic zone is the section of the ocean floor.

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Descnbe how technology causes change
-Biology

Answers

Answer:

a technological change is an increase in the efficiency of a product or process that results in an increase in output, without an increase in input. ... Processes or products, such as the telephone, move through technological change in three stages: Invention - the creation of a new product or process

Explanation:

True or false, if a peptide bond was formed between amino acids 2 & 3 water would be formed from the atoms circled??? and why would this be??

Answers

Answer:1 molecule of water will produce

Explanation:

to form peptide bond between two amino acids

It will produce (molecule)

Which statement describe a pattern shown in the data?

Answers

The data from trial 3 are inconsistent with the dat as from trials 1 and 2


Which factor is most important for classifying two species into the same
group?
A. The species live in the same place.
O B. The species have different common ancestors.
O C. The species have the same common name.
D. The species have the same set of traits.
SUBMIT​

Answers

Answer:

d

Explanation:

ap3x

The factor used in classifying two species into the same group is D. The species have the same set of traits.

What are traits in a orgaism?

Character traits csn be regarded as the valued aspects of a organism behavior.

When making classification, especially two species into the same group, traits serves as important factor because it list the characters in the organism.

Learn more about traits at:

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