Question

During a quiz a teacher asked some students about atoms. The 1st student said ”the atoms of the same elements can never differ from each other”, the second student said ” atoms of different elements can sometimes have same number of nucleons”. The the third student said ” atoms of the same elements can have different number of nucleons”. Identify who out of the three is correct. *
First student
Second student
Third student
first and second student are correct
second and third student are correct

Answer 1

Explanation:

First student

Second student

Third student

first and second student are correct