What are canal rays?

Find the valency of chlorine,sulphur,and magnesium.

For the symbols $H$,$D$,and $T$,tabulate the number of three sub-atomic particles found in each of them.

If the number of electrons in an atom is $8$ and the number of protons is also $8$,then $(i)$ what is the atomic number of the atom? and $(ii)$ what is the charge on the atom?

On the basis of Rutherford's model of an atom,which subatomic particle is present in the nucleus of an atom?

Explain with examples $(i)$ Isotopes and $(ii)$ Isobars. Give any two uses of isotopes.