1. Who does the atomic number of an element represent?

a) The number of neutrons in the nucleus
b) The number of protons in the nucleus
c) The number of protons and electrons in the atom
d) The number of neutrons and electrons in the atom

2. In an atom the number of protons is always the same as the number of?

a) Electrons
b) Neutrons
c) Nucleons
d) Ions

3. To calculate the number of neutrons in an atom you subtract the number from the number.

4. Where are the protons found in an atom?

a) In the nucleus
b) In the shells

5. To calculate the mass number of an atom you simply add the number of positively charged and the number of neutral together.

6. Which sub-atomic particle or particles found in an atom are responsible for almost all the mass of the atom?

a) Electrons and neutrons
b) Neutrons
c) Protons and neutrons
d) Protons

7. Which of the following statements is correct?

a) Electrons have a positive charge and protons a negative charge.
b) Neutrons have no charge while electrons have a positive charge.
c) Protons have no charge while neutrons have a positive charge.
d) Protons have a positive charge and electrons have a negative charge.

8. The first electron shell can hold a maximum of 2 electrons while the second electron shell can hold a maximumum of electrons.

9. Phosphorus has an atomic muber of 15. What is its electron arrangement?

a) 2, 8, 18.
b) 2, 8, 7.
c) 2, 8, 5.
d) 2, 7, 8.

10. An atom has an electron arrangement of 2, 8, 7. How many protons does this element have and where in the periodic table will this element be found?

a) 34 protons and in group 2 .
b) 17 protons and in group 17 .
c) 32 protons and in group 15.
d) 17 protons and in group 7 .