Question

Element that corresponds to atomic number 18?

Answer 1

Argon

Explanation:

Atomic number is the top number on the periodic table

Answer 2

Argon `(Ar)`

Explanation:

Have a look at the periodic table. Then, look at the top number of each element, and that is the atomic number. When you reach element number `18` on the periodic table, there should be an element with a symbol `Ar`, and it denotes the element argon.

Argon is an unreactive noble gas.