Question

read the passage and use the diagram to answer the next question.
the following figure shows the bond formation of sodium chloride which is a
compound commonly known as table salt.

1. select the answer that shows the numbers in the correct order to complete

the sentence.
a sodium atom has _ valence electron(s).
a chlorine atom has _ valence electron(s).
a. one; seven
b. eleven; seventeen
c. seven; seventeen
d. one; eleven

Explanation:

Valence electrons are the electrons in the outermost shell of an atom. Sodium (Na) has an atomic number of 11. Its electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{1}\). The outermost shell (3rd shell) has 1 electron. Chlorine (Cl) has an atomic number of 17. Its electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}\). The outermost shell (3rd shell) has \(2 + 5=7\) electrons.

Answer:

A. one; seven