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i) equal no of atoms of each element
ii) on either side of the arrow of the equation

A Unbalanced Equation:
HgO              ----------->          Hg + O₂
No. of atoms:
Hg=1, O=1 (left side)                          Hg=1, O=2 (right side)

1. Balance the oxygen atoms:
2HgO         ---------------->        Hg + O₂
No. of atoms now are:
Hg=2, O=2 (left side)                            Hg=1, O=2 (right side)

2. Balance the mercury atoms:
2HgO          ----------------->       2Hg + O₂
No. of atoms now are:
Hg=2, O=2  (left side)                           Hg=2, O=2 (right side)

Hence, the equation is balanced.
2HgO  ----------------->  2Hg + O₂

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