Question

If an element has the same number of protons and electrons, but extra neutrons and therefore extra mass...It is called a(an) ___________________.

Answer 1

Atoms With The Same Number Of Protons But Different Numbers Of Neutrons Are Called Isotopes. Because The Number Of Neutrons Can Vary For A Given Element, The Mass Numbers Of Different Atoms Of An Element May Also Vary.

Answer 2

Answer:

therefore extra mass...It is called an atom