What is the relative mass for electron?

Proton number also known as

Copper has a mass number of 64, atomic number of 29. How many electron does Copper has?

Isotopes are atoms of the same element with the same numbers of ______ but different number of _______.

Chlorine has 2 isotopes, Chlorine-35 and Chlorine-37. The relative atomic mass of Chlorine is given to be 35.5. Calculate the relative abundance of Chlorine-37.

Isotopes will have same _______ properties but different ________ properties.

What are the names of 4 sub shells?

How many electrons can principal quantum shell, 2p contain?

As the principal quantum number, n. increases, the energy gap between successive shells gets _____

Atoms with the same number of valence electrons will have the same _______ properties.

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