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# When magnesium is burnt in presence of air the weight of magnesium:A) IncreasesB) DecreasesC) Does not changeD) Increases then decreases

Last updated date: 26th Mar 2023
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Hint: We have to know that in chemistry, periodic tables play a vital role. In the periodic table totally $118$ elements. In the periodic table totally $18$ columns and $7$ rows. The columns are called as groups. Hence, $18$ groups in the periodic table. The rows are called periods. Hence, the total $7$ period in the table. Magnesium is present in the second group and the oxygen is present in the sixteenth group of the periodic table.

We also need to know that the atomic number of magnesium is $12$. It is one of the alkaline earth metals in the periodic table. It is present in the third period and second group in the periodic table. The symbol of magnesium is ${\text{Mg}}$.
The atomic number of the oxygen is $8$. It is present in the second period and sixteenth group in the periodic table. The symbol of oxygen is ${\text{O}}$.
${\text{2Mg + }}{{\text{O}}_{\text{2}}} \to {\text{2MgO}}$