Question

Question #ec39a

Answer 1

oxygen

Explanation:

There are two ways to do it - one with a periodic table, one by counting electrons.

By periodic table:
Two shells: so it'll be in the second row of the periodic table.

6 valence electrons: group 16 has 6 valence electrons. So the element in row 2, group 16 is your answer: oxygen. Double check - it has 8 electrons, 2 of those in one shell, 6 in the outermost shell.

electron numbers
You know that basic shell counting goes 2,8,8. So an element with 2 shells will have 2 electrons from the first shell, and then as your element has 6 valence electrons; 6 from the next shell. `2+6=8 :.` your element is oxygen.