Question

question 8
which atom(s) is chemically stable?
17: chlorine 2,8,7 10: neon 2,8 11: sodium 2,8,1

o a. cl and ne
o b. na and ne
o c. na
o d. ne

Explanation:

An atom is chemically stable when its outermost electron - shell is full. Chlorine has 7 electrons in its outermost shell and is reactive. Sodium has 1 electron in its outermost shell and is reactive. Neon has 8 electrons in its outermost shell, which is a full outer - shell configuration (octet rule for main - group elements), making it chemically stable.

Answer:

d. Ne