Which of the following elements matches the criteria below?

1. found in period 2

2. can gain or lose 4 electrons to become its nearest stable noble gas

a. f

b. be

c. o

d. c

The answer to your question is below

Explanation:

1. Found in period 2. All the elements in the list are found in period 2.

a. F   This option is correct

b. Be  Beryllium is located in period two.

c. O  also oxygen is found in period 2.

d. C Carbon is found in period 2.

2.- Can gain lose 4 electrons to become its nearest stable noble gas. Only Carbon.

a. F    This option is wrong, F becomes stable when it gains 1 electron.

b. Be  Beryllium becomes stable when it loses 2 electrons.

c. O  Become stable when it gains 2 electrons.

d. C Become stable when it gains or loses 4 electrons.

a electronegativity decreases beacuse the size of nucleus is bigger.