covalent bond and coordinate bond

Covalent bonds can be formed between

• alkali metal elements with halogens

• element of metal lakali soil with halogens

• alkali metal elements with noble gases

• oxygen element with an alkali metal

Pairs of elements that can combine to become covalent compounds

• Oxygen and carbon

• Oxygen and calcium

• Chlorine and sodium

• Chlorine and magnesium

The right statement to explain the formation of covalent bonds is

• Some electrons are given from one atom to another

• Some electrons are shared by bonding atoms

• Both atoms get electrons to form ions

• Neutrons are shared by the two binding atoms

The molecules that have triple covalent bonds are

• Carbon dioxide (CO2)

• Methane (CH4)

• Asamm chloride (HCl)

• Nitrogen (N2)

Coordination covalent bonds can only be formed if

• Intermolecular traction occurs between hydrogen atoms bound to very electronegative atoms

• positive ions and negative ions whose electron configurations are the same as noble gases

• one atom has a free electron pair (PEB)

• there is an attractive force between the positive charge of the nucleus of a metal atom and the negative charge of a valence electron