Question #ec39a
1 Answer
Nov 14, 2017
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.