Question

what is the atomic number of an element that has 43 protons and 50 neutrons

Answer 1

Atomic number of an atom is  same as proton number.

(Atomic number = proton number )  

The number of proton present in the nucleus of an atom is known as atomic number or proton number.

Atomic number is specific and unique for each atom / element . i.e atomic number of two atom cant be same.

The summation of atomic number and number of nutrons present in the nucleus of an atom is known as mass number . ( mass number = atomic number + nutron number)  nutron number and mass number could be same for two different atoms / molecules

Here in this question , the atom has 43 proton hence its atomic number would be 43.

(And mass number of that atom will be 43+50=93)

The atom with 43 atomic number is Technetium (Tc)