2. Each type of atom is called an element. Which part of the atom give the
atoms its Identity?

The smallest particle of an element which is indivisible and takes part is chemical reaction as a whole without division is called an atom.

the three fundamental particles that identify the atoms are protons, neutrons and electrons.

fe 55.85 g/mol and h2o 18.02 g/mol.

since electrons are negative the answer is neagtaive