Unit 2 - Chemistry

How do metal atoms form ions?

• They lose electrons to form negative ions.

• They gain electrons to form positive ions.

• They lose electrons to form positive ions.

• They gain electrons to form negative ions.

Which of these statements about a negative ions is true?

• It has an equal number of protons and electrons.

• It has more protons than electrons.

• It has more electrons than protons.

What happens when sodium and chlorine atoms from sodium chloride?

• An electron transfers from each sodium atom to each chlorine.

• An electron transfers from each chlorine atom to each sodium atom.

• Sodium and chlorine atoms share electrons.

What is a covalent bond?

• A bond formed between oppositely charged ions.

• A bond formed when two atoms share a pair of electrons.

• A bond formed by delocalized electrons.

In a Lewis structure diagram, what does each dot represent?

• A neutron.

• A proton.

• An electron.

What combination of elements will form covalent bonds?

• Metal atom and another metal atom.

• Metal atom and non-metal atom.

• Non-metal atom and another non-metal atom.

Which of the following pairs of elements would join together with ionic bonding?

• Sodium and bromine.

• Iron and chromium.

• Hydrogen and sulfur.

• Vanadium and aluminium.

Which of the following bonds can conduct electricity?

• Ionic bond.

• Polar covalent bond.

• Non-polar covalent bond.

What is the name of following compound (using the stock nomenclature)?

Ni₂O₃

What is the chemical formula of mercury (II) oxide?