For the symbol $H$, $D$ and $T $ tabulate three sub-atomic particles found in each of them.
If bromine atom is available in the form of, say, two isotopes $_{35}^{79}Br$ $(49.7 \%)$ and $_{35}^{81}Br$ $(50.3 \%),$ calculate the average atomic mass of bromine atom.
The average atomic mass of a sample of an element $X$ is $16.2\,u $. What are the percentages of isotopes $_8^{16}X$ and $_8^{18}X$ in the sample ?
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 ?
Number of valence electrons in $Cl^-$ ion are :
If $Z = 3$, what would be the valency of the element? Also, name the element.
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