Question

If an atom has three shell and number of valence electrons are two. Is this element metal

or non-metal and why? Name the element and it’s valency.

Answer 1

Metal

Element: Calcium

Valency: 2

Step-by-step explanation:

To find the element, let's use the periodic table. (Look below)

We already went past 3 shells, just need the 2 electrons after it.

Just skip to the 4th row and count 2 to the right

We end up at Calcium.

Calcium is a metal and we're also on the alkaline earth metals column.

Calcium will need to lose 2 electrons to reach stability, so the valency is 2.