Arrange the following elements from greatest to least tendency to accept an electron. Rank from greatest to least tendency to accept an electron. To rank items as equivalent, overlap them.

Mg, Si, Na, S, Cl

Cl-S-Si-Na-Mg

Explanation:

The elements want to have eight electrons in their outmost shell so that they are stable. Chlorine (Cl) is the one that has greatest tendency to accept an electron since it has 7 electrons, so it only needs one more to have a full shell and be stable, Sulfur (S) has 6 electrons, so it needs 2 more to have an outmost full shell, Silicon (Si) has 4 electrons in its outmost shell, so it needs 4 more to be stable, sodium (Na) has 1 electron in its outmost shell, so it needs 7 electrons, and Mg has 2 electrons in its outmost shell.