Atoms of metals have only a few electrons in their valence shells while atoms of non-metals generally have more electrons in their valence shells. Metallic character is closely related to atomic radius and ionisation enthalpy. Metallic character increases from top to bottom in a group and decreases from left to right in a period. Metallic character is inversely related to electronegativity.
Non-metals are present in the periodic table at

Options

A. right side
B. left side
C. middle
D. both right and left

Answer

To determine the location of non-metals in the periodic table, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Periodic Table**: The modern periodic table is organized into groups (columns) and periods (rows). There are 18 groups and 7 periods.

2. **Identify the Groups and Periods**:
- Groups are numbered from 1 to 18 from left to right.
- Periods are numbered from 1 to 7 from top to bottom.

3. **Locate Metals in the Periodic Table**:
- Metals are primarily found on the left side of the periodic table. This includes groups 1 and 2 (alkali and alkaline earth metals) and the transition metals in groups 3 to 12.

4. **Identify the Position of Non-Metals**:
- Non-metals are located on the right side of the periodic table. They are primarily found in groups 13 to 18.

5. **Differentiate Between Non-Metals and Other Elements**:
- While groups 13 to 18 contain non-metals, they also include metalloids (elements with properties of both metals and non-metals). However, the majority of elements in these groups are non-metals.

6. **Conclude the Location of Non-Metals**:
- Therefore, the non-metals are predominantly located in the right-hand side of the periodic table, specifically in groups 13 to 18.

### Final Answer:
Non-metals are present in the periodic table on the right side, mainly in groups 13 to 18.