Question

An element has 2 electrons in its N shell.

1. What is its atomic number?
2. State its position in the periodic table.
3. Is it a metal or a non-metal?
4. State the name assigned to this group.
5. What is the valency of this element?

Answer 1

1. Atomic number of element is (2 + 8 + 8 + 2) = 20.
2. Position in the periodic table is the 4^th period. (Four shells).
3. It is metal.
4. The name assigned to this group is IIB.
5. Valency of the element is 2.