Draw a sketch of Bohr’s model of an atom with three shells.
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.
Isotopes of an element have
If $Z = 3$, what would be the valency of the element? Also, name the element.
Write the distribution of electrons in carbon and sodium atoms.
Number of valence electrons in $Cl^-$ ion are :
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