# Which element in period 2 has the most mass?

##### 1 Answer
Sep 13, 2016

The element in Period 2 with most mass is clearly the element with the highest atomic number, $Z$, and that is $N e$, $Z = 10$, $21.08 \cdot g \cdot m o {l}^{-} 1$.

#### Explanation:

Of course we refer to atoms; because neon is an inert gas, with an intrinsically low density.