Question

Choose the element having the largest size from the following elements- Chlorine, Helium, Phosphorus, Magnesium, Cesium.

Answer 1

1. Trend of the size of atom: The size of the atom increases on moving down the group and decreases on moving from left to right in a periodic table.
2. Helium belongs to Period 1.
3. Magnesium, Phosphorus, and Chlorine belong to period 3.
4. Cesium belongs to period 5.
5. As the size of the atom increases down the group, thus Cesium has the largest size among the given elements.