Structure of atom class 9 Blank quiz

Class 9 Science - Structure of Atom Quiz

1. The smallest particle of an element that retains the properties of that element is called ________.

2. The number of protons in the nucleus of an atom is called its ________ number.

3. The mass of an electron is approximately ________ times smaller than the mass of a proton.

4. The total number of protons and neutrons in the nucleus of an atom is called its ________ number.

5. The number of electrons in an atom is equal to the number of ________ in the nucleus.

6. The negatively charged particles present outside the nucleus of an atom are called ________.

7. The positively charged particles present in the nucleus of an atom are called ________.

8. The atomic number of an element is equal to the number of ________ in its nucleus.

9. The total number of electrons present in the outermost shell of an atom is called its ________ number.

10. The sum of the number of protons and neutrons in the nucleus of an atom is called its ________ number.