1. Atoms have no overall charge; they are neutral simply because they have equal numbers of positively charged in their nucleus and negatively charged in their electron shells.

2. What information does the atomic number of an element give you?

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

3. In terms of electrons what happens when a metal atom reacts with a non-metal atom?

a) The metal atom will gain electrons
b) The metal atom will lose electrons
c) The non-metal atom will lose electrons
d) They will share electrons and form a covalent bond

4. Positively charged ions are called:

a) Cations
b) Anions

5. Magnesium is a metal found in group 2 of the periodic table, it will form an ion with a charge when it reacts with a element such as chlorine.

6. The noble gases in group 0 of the periodic table are very unreactive elements because they have outer electron shells.

7. Which group in the periodic table contains elements that will form ions with a 1- charge?

a) Group 1; the alkali metals
b) Group 0; the noble gases
c) Group 7; the halogens
d) Group 5 elements

8. How many electrons will the alkali metal sodium lose when it forms a sodium ion?

a) 1
b) 2
c) 3
d) 8

9. When the alkali metal potassium reacts with chlorine the potassium atom will an electron and the chlorine atom will an electron. The potassium atom will form an ion with a charge and the chlorine atom will form a chloride ion which has a charge.

10. Nitrogen is a group 5 element. What charge will a nitride ion have?

a) 1+
b) 3+
c) 1-
d) 3-