Elements have been discovered with up to how many energy levels

Answers

Answer 1
Answer: 20 because each row has 20 columns  

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Most plants and all animals depend on _____ to meet their need for nitrogen.lightning strikes
denitrifying bacteria
bacteria that break apart cellulose
nitrogen-fixing bacteria

Answers

Answer: nitrogen fixing bacteria

Explanation:

Most plants and animals are dependent on nitrogen fixing bacteria for their nitrogen requirements. As they are incapable of absorbing the atmospheric nitrogen directly. The soil bacteria traps the atmospheric nitrogen convert it into forms like ammonia, nitrates and nitrites which are readily absorbed by the plants and some soil borne animals.

They depend on nitrogen-fixing bacteria, which convert atmospheric nitrogen into a usable form.

When electrons absorb energy they are able toa. move from exited states down to their ground states.B.move from their ground states up to excited states.C.attach to the nucleus.D.form a bond with the nearest proton.?

Answers

When electrons absorb energy they are able to move from their ground states up to excited states. The answer is letter B. an example of this is when you light a match. The molecules of the matchstick are in its ground state. When you flick it on the ground or anything hard, it causes its molecules to move into the excited state and thus causing fire.

How many electrons in an atom could have these sets of quantum numbers? n=2?

Answers

A maximum of 8 electrons can share the quantum number  n = 2.

Principal Quantum number has a symbol of "n". It tells you the energy level on which an electron resides. You need to determine exactly how many orbitals you have in this energy level before you can determine the number of electrons that can share the value of n.

The number of orbitals you get per energy level can be found using this formula:

no. of orbitals=n²

Each orbital can hold a maximum of two electrons, the formula would be:

no. of electrons=2n²

Using the given formulas:

no. of orbitals = n² 2² 4

no. of electrons =2 * 




A piece of iron (Cp = 0.450 J/(gi°C)) that has a mass of 21.5 g and an initial temperature of 100.0°C is submerged in X g of water (Cp = 4.184 J/(gi°C)) at 20.0°C. The temperature of the system (iron and water) changes to 21.4°C. What is the value of X? A. 041 g. B. 80 g. C. 132 g. D. 574 g

Answers

The problem ask to calculate the value of x if an iron taht has a mass of 21.5g and has an initial temperature of 1000.0C is submerge in Xg of a water at 20C. So the value of X is letter C. 132 g. I hope you are satisfied with my answer and feel free to ask for more 

Answer:

D) yes, because (StartFraction b Over a + c EndFraction)(a + c) = b

Explanation:

just did it on edge 2020

A 1. 00 L volume of HCl reacted completely with 2. 00 L of 1. 50 M Ca(OH)2 according to the balanced chemical equation below. 2HCl Ca(OH)2 Right arrow. CaCl2 2H2O What was the molarity of the HCl solution? 0. 375 M 1. 50 M 3. 00 M 6. 00 M.

Answers

Answer:

The first step is to find the number of moles of OH⁻ that reacted with the HCl.  To do this multiply 2.00L by 1.50M to get 3 moles of Ca(OH)₂.  Then you multiply 3 by 2 (there are 2 moles of OH⁻ per every 1 mole of Ca(OH)₂) to get 6 moles of OH⁻.  That means that you needed 6 moles of HCl since 1 mole of HCl contains 1 mole of H⁺ and equal amounts H⁺ and OH⁻ reacted with each other.  To find the molarity of the HCl solution you need to divide 6mol by 1L to get 6M.  Tat means that the concentration of the acid was 6M.

I hope this helps.  Let me know if anything was unclear.

Explanation:

How did us participation in ww1 affect the american civilian population

Answers

US participation in world war 1 affect the american civilian population in this following way : women had to get jobs and get more opportunities
Since the majority of the men have to go to the war, the business in the homeland was being taken care of by women

hope this helps

Answer:

explained below.

Explanation:

World war 1  leads to suffer the Americans people a lot .

Young men were forced to go for war which leads to the deplete the financial condition of the house hold. Industry starts to suffer a lot as most of the people who were working has to go for war and man power decreases.

Which leads women to come out of there houses and took job for them so, that they can full fill there needs which starts the new era where woman also start working with men.