Out of the characterstics the mass number (A) and the atomic number (Z) of a nucleus, which one does not change during `beta-decay`.

An atom has mass number A and atomic number Z. How many neutrons are present in its nucleus ?

An atom has mass number A and atomic number Z.How many protons are present in the nucleus ?

Explain,how radioactive nuclei can emit beta- particles even though nuclei do not contain these particles.Hence explain why the mass number of a radioactive nuclide does not charge during beta decay.

If an element M has mass number 24 and atomic number 12, how many neutrons does its atom contain ?

An atom has mass number A and atomic number Z.) How many electrons are revolving around the nucleus ?

How will you represent chlorine atom having mass number 35 and atomic number 17 ?

Give the mass number and atomic number of elements on the righthand side of the decay process "_86^220Ru rarr Po+He .