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If they have the same atomic number but different mass, then they have a different number of neutrons, and they are called ISOTOPES.

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What are atoms that have the same number but different weights?

Atoms that have the same number of protons but different weights are called isotopes. Isotopes of an element have the same atomic number (number of protons), but a different atomic mass (sum of protons and neutrons) due to varying numbers of neutrons.


Are atons of an element having the same atomic no but different atomic weights?

Yes, and they are called isotopes.


What are atoms that have the same number of protons but different mass number?

Atoms with the same number of protons but different mass numbers are called isotopes. Isotopes have the same atomic number but different atomic weights due to variations in the number of neutrons in the nucleus.


What is it called when they have same atomic number but different mass?

They are called isotopes of the same element


What are the atoms called then they have the same atomic number but different mass numbers?

They are called as isotopes in which mass number differ by emmision of radiation


What would you call atoms having some atomic numbers but different mass numbers?

they are called isotopes.


What are atoms with the same atomic number but different mass called?

Atoms with the same atomic number are all atoms of the same element. However, if the atoms have different molecular weights, they are isotopes of the same element.


The various atomic weights of the same element are called what?

Isotopes


What are the masses on the periodic table mostly not whole numbers?

1. First cause: the atomic weight is the sum of the weights of protons, neutrons ans electrons.; they don't have masses as integers. 2. Second cause: also occurs the so-called mass defect. Note: no atomic masses for elements but atomic weights is correct.


The various atomic weights of the same element are called?

Atoms of the same element with different atomic masses are known as isotopes. Isotopes differ only by the number of neutrons present in the nucleus of the isotopes. The number of protons is the same for all isotopes of an element (because if there were different numbers of protons, then the atoms would not be of the same element).


What is it called when atoms of the same element that have a different atomic weight?

Atoms with the same atomic number (number of protons), but different mass numbers (i.e. different mass) are called isotopes. The difference in mass is due to different numbers of neutrons. For more info: http://en.wikipedia.org/wiki/Isotope


What are atoms of the same element thay have different atomic masses?

Atoms of the same element that have different atomic masses are called isotopes. Isotopes of an element have the same number of protons but different numbers of neutrons. This results in variations in atomic mass while maintaining the same chemical properties.