Is electrons present in side the nucleus or not if yes how

If not how bita rays emitting from nucleus?

Electrons are not present inside the nuclear but it revolve around the nucleus just like earth revolve around the sun . The reason for revolving is that ,there is some force of attraction which holds electrons in its orbit and as we know there are many electrons are present around nucleus and that number of electrons depends on atomic number of element.

Hope it helps you.

Electrons are not present inside the nucleus of the atom. The nucleus is made of proton and neutrons whereas the electrons revolve around the nucleus inside the atom.

For the formation of beta rays, it emerges from the nucleus. This radiation happens in the nucleus when the neutrons are more compared to protons in the nucleus (remember: protons and neutrons are of equal numbers inside the nucleus in a standard atom). So the extra neutrons present in the nucleus turns itself into a proton and electron. So, that's how you end up having electrons in the nucleus. Since electrons does not belong to the nucleus they emerge out as beta radiation.

No, electrons are not present inside the nucleus as positive and negative charge combination makes atom electrically unstable. But in case of beta ray emission,electrons are emitted only when nucleus of an atom undergo Radioactive decay. It was emitted by neutron i.e., β- decay. Don't mix atom structural arrangement and radioactive decay phenomenon both are entirely different.

It is assumed that beta-decay is the conversion of a neutron into proton and electron. In radioactive emissions of beta particles (energetic electrons), a bound neutron in the nucleus changes into a proton inside the nucleus, with the emission of an electron and an anti-neutrino.