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hodyreva [135]
4 years ago
10

An atom in the ground state has seven valence electrons. This atom could be an atom of which element?

Chemistry
2 answers:
DENIUS [597]4 years ago
5 0

Answer: Option (A) is the correct answer.

Explanation:

An atom who has seven valence electrons in its ground state will have the following electronic configuration in its sub shells as 2, 7.

Thus, there will be in total 9 electrons and it is known that fluorine has atomic number 9.

Whereas sodium has 2, 8, 1 electrons in its sub-shell.

Calcium has 2, 8, 8, 2 electrons in its sub-shell and oxygen has 2, 6 electrons in its sub-shell.

Thus, we can conclude that out of the given options, fluorine is the element whose atom in the ground state has seven valence electrons.

Igoryamba4 years ago
4 0
The atom that has 7 valence electrons is A. fluorine.
It is in the halogens group. 
It needs 1 more electron to become stable, therefore, it is highly reactive. 
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Answer:

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Explanation:

We begin by writing the skeletal equation as shown below:

NH4NO3 —> N2 + O2 + H2O

The equation can be balance as follow:

There are 4 atoms of H on the left side of the equation and 2 atoms on the right side. It can be balance by putting 2 in front of H2O as shown below:

NH4NO3 —> N2 + O2 + 2H2O

Now we have a total of 4 atoms of O on the left side and 3 atoms on the right side. It can be balance by putting 1/2 in front of O2 as shown below:

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Now, multiply through by 2 to clear the fraction as shown below

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