Year 8 Unit Quiz

The ion N^3- has ______ electrons.

• 4

• 7

• 10

• 13

The ion Mg²⁺ has _______ protons.

• 10

• 12

• 14

• 16

The ions of the alkaline earth metals (group 2) will have a charge of ________.

• -1

• -2

• +1

• +2

The ions of the alkali metals (group 1) will have a charge of ________.

• -1

• -2

• +2

• +1

The ions of the halogen group (group 7) will have a charge of ________.

• -1

• -2

• +2

• +1

The ratio of calcium(Kalium) ions to bromine(Brom) ions in calcium bromide produces a chemical formula of

• Ca₂Br

• CaBr₂

• CaBr

• Ca₂Br₂

Comparing the neutral atom Cl with the negative ion Cl –, the negative ion has

• the same number of electrons as the neutral atom.

• fewer electrons than the neutral atom.

• more electrons than the neutral atom.

• no electrons anymore.

What charge will a phosphorous (Phosphor) ion have?

• -2

• -3

• +3

• +2

What is the chemical formula for the compound we call “table salt”?

• NaCl

• H₂O

• CO₂

• NaOH

Which two groups on the periodic table are most reactive?

• Transition metals and alkaline earth metals

• Lanthanides and noble gases

• Halogens and noble gases

• Alkali metals and halogens