SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which element has two valence electrons?
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Nitrogen (N)
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Carbon (C)
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Beryllium (Be)
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Oxygen (O)
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Explanation:
Detailed explanation-1: -Both heliumHe and beryllium Be have two valence electrons.
Detailed explanation-2: -Beryllium has two valence electrons.
Detailed explanation-3: -The atomic number of Helium is Z = 2. The electronic configuration is, 2. Therefore, Helium is a noble gas with two valence electrons.
Detailed explanation-4: -Beryllium has an electronic configuration of1s2 2s2 as the atomic number of Beryllium is 4; hence, the Beryllium valence electrons would be 2.
Detailed explanation-5: -Beryllium is the fourth element with a total of 4 electrons. In writing the electron configuration for beryllium the first two electrons will go in the 1s orbital.
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