An Atom Whose Atomic Number is 10 Has How Many

Question

An atom whose atomic number is 10 has how many electrons in its outermost energy level?
A) eight
B) ten
C) two
D) three
E) five

Accepted Answer

An atom with an atomic number of 10 is neon, a noble gas. Neon has a full outer shell of electrons, which means it has 8 electrons in its outermost energy level. This configuration gives it stability.