1. Define atom.
Atom is the smallest particle of a substance.

2. What are the subatomic particles found in an atom?
The subatomic particles found in an atom are electrons, protons, and neutrons.

3. Define charged particle.
Charged particle is a particle that has an electric charge.

4. Define electric charge.
Electric charge is the physical property of particles such as electrons and protons. Electric charge causes other particles to experience a force.

5. What are the charged particles found in an atom?
Electrons and protons are the charged particles found in an atom.

6. What are the different types of charged particles?
Charged particles are of two types: positive charges and negative charges.

7. What are the negatively charged particles in an atom?
Electrons are the negatively charged particles in an atom.

8. What are the positively charged particles in an atom?
Protons are the positively charged particles in an atom.

9. What is the mass of an electron?
The mass of an electron is 9.107 × 10-31 kilograms.

10. What is the mass of a proton?
The mass of a proton is 1.672 × 10-27kilograms.

11. Define atomic number.
The total number of protons in the nucleus of an atom is called atomic number.

12. Define neutron number.
The total number of neutrons in the nucleus of an atom is called neutron number.

13. Define mass number.
Mass number is the total number of protons and neutrons in the nucleus of an atom.
Mass number can be mathematically written as

A = Z + N

Where,
A = mass number
Z = atomic number
N = neutron number

14. Which particles in an atom have no charge?
Neutrons in an atom have no charge.

15. What happens when two like charges (Two protons or two electrons) are placed close to each other?
They get repelled.

16. What happens when two opposite charges (One proton and one electron) are placed close to each other?
They get attracted.

17. Which force causes electrons and protons to experience an attractive or repulsive force from each other?
Electrostatic force causes electrons and protons to experience an attractive and repulsive force from each other.

18. Which force binds the protons and neutrons together to form a nucleus?
The strong nuclear force between the protons and neutrons binds them together to form a nucleus.