The transtition element in Period 4, Group IVB/4​

What can be found in the ionosphere

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.

Which type of intermolecular attractions holds ammonia molecules together with other ammonia molecules?