Periodic table

The first shell around the nucleus can accommodate how many electrons

Are electrons placed in shells around the nucleus?

What is noble gas configuration

The second shell around the nucleus can accommodate how many electrons

Isotopes are atoms which contain different number of neutrons in its nucleus

What is an electron ?

Electrons that are in the first energy level are....

Is an ion, an atom or molecule with an electric charge due to the loss or gain of electrons.

number of electrons that are added or removed from outer shell of an atom to complete it

Atoms containing unstable combinations of neutrons and protons, or excess energy is...

Electrons that are in the second energy level are....

Atoms with an unstable nucleus shed excess particles and energy in the form of radiation..

What are electrons arranged in?

Isotopes have different numbers of neutrons, as not all weigh the same or have the same mass

What is the meaning of electron configuration