SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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According to periodic trends, which element would have more valence electrons than oxygen?
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carbon (C)
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chlorine (Cl)
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selenium (Se)
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phosphorus (P)
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Explanation:
Detailed explanation-1: -For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell. We can write the configuration of oxygen’s valence electrons as 2s²2p⁴.
Detailed explanation-2: -Example: A neutral chlorine atom contains 17 electrons, while a Cl-ion contains 18 electrons. Because the nucleus can’t hold the 18 electrons in the Cl-ion as tightly as the 17 electrons in the neutral atom, the negative ion is significantly larger than the atom from which it forms.
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