CBSE Class 9 Science Atomic Foundations of Matter (Class 9 NCERT New) Quiz 6

1. What is the mass number and name of an element with 8 protons and 8 neutrons?

A 16 - Carbon B 16 - Oxygen C 24 - Oxygen D 8 - Neon

2. An element with a mass number of 10 and an atomic number of 6 has how many protons?

A 5 B 8 C 6 D 10

3. What is the atomic number of the atom pictured?

A 11 B 12 C 22 D 23

4. How many protons, electrons and neutrons does an neutral atom of Calcium have? Its atomic number is 20 and the mass number is 40.

A 20 protons, 18 electrons and 40 neutrons B 20 protons, 20 electrons and 20 neutrons C 40 protons, 40 electrons and 20 neutrons D 20 protons, 18 electrons and 20 neutrons

5. Ag--110 and Ag--112 are two forms of silver with different mass # so they are

A compounds B isotopes C orbitals D neutrons

6. What is the mass number of this element?

A 5 B 27 C 32 D 59

7. Thompson was the first to discover a subatomic particle - the electron. What are the others?

A neutrons & positrons B protons & neutrons C positrons & quarks D protons & positrons

8. Rutherford concluded that the amount of positive charge varies

A with the amount of electrons in the nucleus. B as the the amount of isotopes varies. C with the amount of neutrons in the nucleus. D with different elements.

9. The word "electron" comes from the ancient Greek word meaning

A amber. B to change or become flexible. C elektron. D electricity.

10. Electrons can best be described as having a

A large size, positive charge. B very small size, positive charge. C large size, negative charge. D very small size, negative charge.