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Answer :
Final answer:
The balanced equation for the reaction of elemental strontium (Sr) with oxygen (O2) to form strontium oxide is Sr + O2 → 2SrO, which represents a 1:1 reaction of strontium to oxygen atoms, conforming with their valencies and the diatomic nature of oxygen.
Explanation:
The balanced equation for the reaction of elemental strontium (Sr) with oxygen (O2) is:
Sr + O2 → 2SrO
When strontium reacts with oxygen, it forms strontium oxide (SrO). Since strontium is in Group 2 of the periodic table, it has a valency of +2, and therefore it will combine with oxygen (which has a valency of -2) in a 1:1 ratio, meaning one strontium atom reacts with one oxygen atom to form one formula unit of strontium oxide. However, oxygen is diatomic in nature, meaning it exists as O2 in its stable form. Thus, it takes two strontium atoms to react with one oxygen molecule to create two units of SrO, resulting in the balanced chemical equation shown above.
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