Both Br and I are part of the Halogen group. They have similar chemical properties. In this case, the chemical equation represents a displacement reaction in which the I in MgI2 is displaced by Br to form MgBr2:
MgI2 + Br2 => MgBr2 + I2
The equation is valid and balanced.
count the elements in eqn MgI2 + Br2 -> MgBr2 + I2
1 Mg, 2I, 2Br on the left n
1 Mg, 2I, 2Br on the right
they are equal so the eqn is balanced
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