GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Ba, Br, Bi
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Sr, Sn, I
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O, S, Te
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Mn, Hg, Cu
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Detailed explanation-1: -Lewis symbols (also known as Lewis dot diagrams or electron dot diagrams) are diagrams that represent the valence electrons of an atom. Lewis structures (also known as Lewis dot structures or electron dot structures) are diagrams that represent the valence electrons of atoms within a molecule.
Detailed explanation-2: -Hence, Strontium (Sr) has 2 electrons as valence electrons.
Detailed explanation-3: -So, Lewis Symbol is the simple notation which is used to represent the valence electron of an atom.
Detailed explanation-4: -Elements in the same group all have the same number of valence electrons and therefore similar chemical properties. Valence electrons help in predicting chemical reactions. For example, since hydrogen (H) is in group 1, it has 1 electron in its outer energy level.