Answer:
The same number of atoms of each element must appear on both sides of a chemical equation. However, simply writing down the chemical formulas of reactants and products does not always result in equal numbers of atoms. You have to balance the equation to make the number of atoms equal on each side of an equation.
Explanation:
MgO
MgI2
PbO2
PbI4
These are the possible compounds
The correct answer is B.LONGITUDINAL WAVES.
