What are the trends in the structure and behaviour of these
elements in Group 1

Deposition is the transition of matter going from gas to solid without passing through the liquid phase.a.) gas—-> solid

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.

The answer is falsegravitational force is independent of medium and depends only on the masses of the two objects and the distance between them.

Bromine has atomic number  35  which means there are  35 protons  and  44  neutrons to give a total of 79 nucleons. the fact that it's a positive ion means that it has lost an electron; so there'll be  34 electrons.