1. What is Atomic Number?

The atomic number is a fundamental property of chemical elements that defines the identity of an atom. It represents the number of protons found in the nucleus of an atom and determines the element's position in the periodic table.

2. How to Calculate Atomic Number

The atomic number is calculated using the simple formula:

Where:

• Atomic Number — Unique identifier for each chemical element
• Number of Protons — Count of protons in the atomic nucleus

Explanation: For neutral atoms, the atomic number also equals the number of electrons. However, the defining characteristic is always the proton count.

3. Importance of Atomic Number

Details: The atomic number determines an element's chemical properties, its position in the periodic table, and its behavior in chemical reactions. It is the primary organizing principle of the periodic table.

4. Using the Calculator

Tips: Enter the number of protons in the atomic nucleus. The atomic number will be calculated automatically. Valid values range from 1 to 118 (known elements).

5. Frequently Asked Questions (FAQ)

Q1: Can atomic number change?
A: No, the atomic number is fixed for each element and cannot change without changing the element itself through nuclear reactions.

Q2: What's the difference between atomic number and mass number?
A: Atomic number is the proton count, while mass number is the total number of protons and neutrons in the nucleus.

Q3: Do isotopes have the same atomic number?
A: Yes, isotopes of the same element have identical atomic numbers but different numbers of neutrons.

Q4: How is atomic number related to the periodic table?
A: Elements are arranged in order of increasing atomic number in the periodic table, which creates periodic trends in chemical properties.

Q5: Can two elements have the same atomic number?
A: No, each element has a unique atomic number that defines its identity.