Question

Explain why calcium can form a ca2+ ion but not a ca3+ ion

Answer 1

Calcium has three filled electron energy levels. Its 4th level has 2 electrons; it wants to donate these 2 to achieve stability

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Answer 2

Calcium can form a Ca2+ ion but not a Ca3+ ion because of two valence electrons, which are the electrons in the outermost shell.

• With an atomic number of 20, calcium is a metal that belongs to group 2 of the periodic table. Its arrangement is 2,8,8,2.
• Additionally, it possesses more protons than electrons. Electrons are neutral, while protons are positive. Calcium gains a +2 charge and forms an ion when it loses its outer electrons.
• Hence, this is the reason why calcium can only form Ca2+ and not Ca3+.

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