4) Name an element that follows“ duet rule”.
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4
Answer:
hydrogen and helium
Explanation:
The duet rule states that hydrogen and helium may have no more than two electrons in their valence shells. The rule comes from quantum mechanics, which says that the lowest energy level (n = 1) of an atom can contain only two electrons.
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2
Answer:
Helium
Explanation:
The rule of duet refers to the first five elements of the periodic table. They are most stable when the 1s orbital is filled with two (duet) electrons.
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