SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How does calcium become an calcium ion?
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it loses 2 electrons
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it gains 2 electrons
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -During the interactions between the atoms, the two electrons in calcium’s outer energy level are transferred to the outer energy level of each of the chlorine atoms. Since calcium lost two electrons, it has 20 protons, but only 18 electrons. This makes calcium a positive ion with a charge of 2+.
Detailed explanation-2: -For example, a neutral calcium atom, with 20 protons and 20 electrons, readily loses two electrons. This results in a cation with 20 protons, 18 electrons, and a 2+ charge. It has the same number of electrons as atoms of the preceding noble gas, argon, and is symbolized Ca2+.
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