S3 Topics 2-5

An atom has an overall charge of neutral because...

• it has an equal number of protons and neutrons

• it has an equal number of neutrons and electrons

• it has an equal number of protons and electrons

An isotope has

• the same number of neutrons and a different number of protons

• the same number of electrons and a different number of neutrons

• the same number of protons and a different number of neutrons

• the same number of protons and a different number of electrons

An isotope of chlorine was found: chlorine-37. How many neutrons does it have?

• 19

• 18

• 21

• 20

When an atom in Group 2 becomes a 2+ ion

• The mass number increases

• The mass number decreases

• The number of occupied energy levels decreases

• The charge of the nucleus increases

What type of bonding does hydrogen bromide possess?

• Ionic

• Covalent molecular

• Covalent network

• Metallic

A solid was tested and it was found to conduct electricity, have a high melting and boiling point and did not dissolve. It was determined it had

• covalent bonds

• metallic bonds

• ionic bonds

A solid was tested and was found to not conduct electricity unless molten or in a solution, this must mean it contains

• ionic bonds

• covalent bonds

• metallic bonds

What is the name of the compound with the formula Au₂O₃?

• Gold(I) oxide

• Gold(II) oxide

• Gold(III) oxide

An example of a covalent network is?

• Magnesium

• Silver

• Silicon

• Bromine

When sodium becomes a 1+ ion, it has an electronic configuration of

• 2,8,1

• 2,8

• 2,7

• 2