# Atoms Of The Same Element With Different Numbers Of Neutrons

### Two atoms have the same number of protons but different numbers of neutrons. What can you conclude about these two atoms?

Thus, hydrogen has an atomic number of 1, while iron has an atomic number of 26. Each element has its own characteristic atomic number. Atoms of the same element can have different numbers of neutrons, however. Atoms of the same element (i.e., atoms with the same number of protons) with different numbers of neutrons are called isotopes. The atoms have different numbers of neutrons which inherently changes the mass. If it had different numbers of electrons it would be an ion. Different numbers of protons make it a different element all together.

### Atoms Of The Same Element With Different Numbers Of Neutrons Are Defined As

That they are isotopes, i.e. the same element, but different atomic masses.

### Atoms Protons Neutrons Electrons Worksheet

#### Explanation:

The number of nuclear protons gives $Z$, the atomic number. The atomic number defines the identity of the element: $Z$ = 6, $C$; $Z$ = 27, $C o$; $Z$ = 47, $A g$.

Of course while there may be the same number of nuclear protons, the nucleus may contain different numbers of neutrons; these give rise to different isotopes; same element, and same chemistry, but different atomic mass. Most elements have a number of isotopes. The quoted atomic mass that appear on the Periodic Table are the weighted average of the isotopes.