What is the atomic number of nitrogen?

7

The correct answer is option (3) 7.

The atomic number of an element represents the number of protons in the nucleus of an atom of that element. In the case of nitrogen, its atomic number is 7. Here's an explanation:

1. Atomic Number Definition:

The atomic number (Z) is a fundamental property of an element and is found on the periodic table. It is equal to the number of protons in the nucleus of an atom of that element.

2. Nitrogen's Atomic Number (Z = 7):

Nitrogen is a chemical element with the symbol N. Its atomic number is 7, indicating that a nitrogen atom has 7 protons in its nucleus.

3. Periodic Table:

The periodic table is organized based on the atomic number of elements. Nitrogen is located in Group 15 (also known as Group V or Group 5A) of the periodic table.

4. Atomic Structure of Nitrogen:

A neutral nitrogen atom has 7 protons, 7 electrons, and an atomic mass close to 14 atomic mass units (u). The number of protons is unique to each element and determines its chemical identity.

In summary, the atomic number of nitrogen is 7, signifying the presence of 7 protons in the nucleus of a nitrogen atom. This number is crucial for identifying nitrogen on the periodic table and understanding its atomic structure.