Same chapter3 marksDifficulty: Medium
Draw the electron dot structure of a molecule of methane and of ammonia, and state the number of lone pairs in each.
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3 marksDifficulty: Medium
Explain the formation of magnesium chloride from its atoms, showing the transfer of electrons.
Original Khojo Papers practice question — not from a past board paper.
Answer
A magnesium atom (2, 8, 2) loses its two outermost electrons to form Mg2+ (2, 8). Each of two chlorine atoms (2, 8, 7) gains one of those electrons to form Cl− (2, 8, 8). The Mg2+ and two Cl− ions are held together by electrostatic attraction, giving MgCl2.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Every ion formed has the stable configuration of a noble gas.
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