3 single science bonding

When ions form, the outer shell of electrons.......

• is full

• contains 8 electrons

• contains 2 electrons

• can contain any number of electrons

What type of ions do metal atoms usually form?

• positive

• negative

What is the formula of a magnesium ion?

• Mg⁺

• Mg²⁺

• Mg^-

• Mg^2-

What is the formula of magnesium chloride?

• Mg₂Cl₂

• Mg₂Cl

• MgCl

• MgCl₂

What type of bonding involves sharing electrons?

• Ionic

• Covalent

• Metallic

What kind of bonding and structure tends to be associated with low melting points and boiling points?

• Simple molecular covalent

• giant ionic lattice

• giant molecular covalent

• metallic

Which kind of bonding and structure allows substances to conduct electricity when solid?

• Metallic

• Covalent

• Ionic

Why does sodium chloride conduct electricity when molten but not when solid?

• molten ions can move freely

• they're too cold when they're solid

• they have too much energy

Name a substance that has a very high melting point and is a non-conductor of electricity in any state.

• Diamond

• Graphite

• Graphene

• Buckminsterfullerene

Why does sodium metal conduct electricity?

• It contains a sea of delocalised electrons that can carry a current

• It can easily move ions around a circuit

• metals conduct electricity