Structure of an atom medium

Structure of an Atom Quiz (Medium)

1. Who discovered the nucleus of an atom?

a) Albert Einstein b) Ernest Rutherford c) J.J. Thomson d) Isaac Newton

2. What is the charge of an electron?

a) Positive b) Negative c) Neutral d) None of the above

3. The number of protons in the nucleus of an atom is also known as:

a) Mass number b) Atomic number c) Neutron number d) Electron number

4. Isotopes of an element have the same number of:

a) Protons b) Electrons c) Neutrons d) None of the above

5. The sum of the number of protons and neutrons in an atom gives its:

a) Atomic number b) Mass number c) Electronegativity d) Valency

6. Which subatomic particle is responsible for chemical reactions and bonding?

a) Proton b) Neutron c) Electron d) Nucleus

7. The energy levels or shells of an atom are occupied by:

a) Neutrons b) Electrons c) Protons d) Nuclei

8. The mass of an electron is approximately:

a) 1.67 x 10^-24 grams b) 9.11 x 10^-31 kilograms c) 1.67 x 10^-27 kilograms d) 9.11 x 10^-28 kilograms

9. What is the total number of electrons in the second energy level of an atom?

a) 2 b) 8 c) 18 d) 32

10. What is the valency of an atom with 6 electrons in its outermost shell?

a) 0 b) 1 c) 2 d) 3