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Atoms and Molecules — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
Question
Write the chemical formula using criss-cross method:
Magnesium bicarbonate.
✓

Answer

The Criss cross method is shown below: The atomic number of magnesium is 12, and the valency of magnesium is two, while the valency of bicarbonate is one. To satisfy the valency of the magnesium atom, it requires two bicarbonates. Therefore, the correct formula of magnesium bicarbonate is M g ( H C O 3 ) 2 .

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