Question

answer me please fast ​

Answer 1

Answer:

Al aluminium

Explanation:

Answer 2

Valency of Na is 1, Mg is 2, Al is 3. Sodium (Na) has the largest atomic radius. As we move from left to right in a period, the atomic radius decreases as increase in nuclear charge pulls the electrons closer to the nucleus reducing the atomic size.

OR

The element which has the largest atomic radius is Cesium. Atomic Radius is defined as the distance between the center of the nucleus and the outermost shell of an atom. Cesium has 6 orbital shells, which means that it automatically is big.