Number of neutrons N = ……

Atomic number is denoted by

Mass number is denoted by

The elements which have a highest number of known isotopes are ......and …

The isotopes of Uranium is used as fuel in …… reactors.

The isotope of …… is used in treatment of cancer.

${}_1^{2}H^2\_1H$ is called …

Xenon and cesiums have … known isotopes.

… are not part of nucleus.

Electron configuration of Neon is ……

Which of the following is a wrong statement ?

If there are no protons in an atom, the consequences are

‘X’ is a subatomic particle. It has neither +ve nor -ve. Then ‘X’ is

If an $\alpha \backslash alpha$ – particle comes closure to a proton, it … proton.

Electron do not fall in nucleus, because