For the symbol H,D and T
tabulate three sub-atomic
particles found in each of them.
With the help of Table 4.1, find
out the mass number of oxygen
and sulphur atom.
If number of electrons in an atom
is 8 and 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?
If K and L shells of an atom are
full, then what would be the total
number of electrons in the atom?
Helium atom has an atomic mass
of 4 u and two protons in its
nucleus. How many neutrons
does it have?
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