Studying the periodic table helps us understand how the size of atoms changes among different elements.

1. Atomic Radius Trend:

• When you look at the periodic table from left to right, the size of the atoms gets smaller. This happens because the positive charge in the nucleus pulls the electrons closer to it.
• For example, the atomic size of Lithium (Li) is about 270 picometers (pm), but it gets smaller to about 186 pm for Neon (Ne).

2. Energy Levels:

• Each row in the periodic table represents a new energy level. So, as you move down the table, the size of the atoms gets bigger because there are more energy levels.
• For instance, the size of Lithium is 152 pm, while Cesium (Cs) is bigger at 262 pm.

Understanding these trends is really helpful for predicting how different elements will react and form bonds with each other.