Table of First 18 Elements

Here is a table of the first 18 elements in the periodic table, along with their atomic numbers, symbols, and atomic masses:

| Atomic Number | Symbol | Atomic Mass |
|---------------|--------|-------------|
| 1 | H | 1.008 |
| 2 | He | 4.0026 |
| 3 | Li | 6.94 |
| 4 | Be | 9.0122 |
| 5 | B | 10.81 |
| 6 | C | 12.011 |
| 7 | N | 14.007 |
| 8 | O | 15.999 |
| 9 | F | 18.998 |
| 10 | Ne | 20.180 |
| 11 | Na | 22.990 |
| 12 | Mg | 24.305 |
| 13 | Al | 26.982 |
| 14 | Si | 28.085 |
| 15 | P | 30.974 |
| 16 | S | 32.06 |
| 17 | Cl | 35.45 |
| 18 | Ar | 39.948 |

Explanation:

1. Hydrogen (H)
- Atomic Number: 1
- Symbol: H
- Atomic Mass: 1.008
- Hydrogen is the lightest and most abundant element in the universe. It is a colorless and odorless gas. It is also a key component of water and many organic compounds.

2. Helium (He)
- Atomic Number: 2
- Symbol: He
- Atomic Mass: 4.0026
- Helium is a colorless and odorless gas that is lighter than air. It is used in various applications such as filling balloons, cooling magnets in MRI machines, and as a protective gas in the welding industry.

3. Lithium (Li)
- Atomic Number: 3
- Symbol: Li
- Atomic Mass: 6.94
- Lithium is a soft, silvery-white metal. It is highly reactive and is commonly used in rechargeable batteries, ceramics, and as a medication for certain mental health conditions.

4. Beryllium (Be)
- Atomic Number: 4
- Symbol: Be
- Atomic Mass: 9.0122
- Beryllium is a lightweight and strong metal. It is used in various industries such as aerospace, defense, and electronics due to its high thermal conductivity and strength-to-weight ratio.

5. Boron (B)
- Atomic Number: 5
- Symbol: B
- Atomic Mass: 10.81
- Boron is a nonmetallic element that is essential for the growth of plants. It is also used in the production of borosilicate glass, ceramics, and as a dopant in semiconductors.

6. Carbon (C)
- Atomic Number: 6
- Symbol: