Name (a) three elements that have a single electron in their outermost shells. (b) two elements that

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Periodic Classification of Elements

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Name

$(a)$ three elements that have a single electron in their outermost shells.

$(b)$ two elements that have two electrons in their outermost shells.

$(c)$ three elements with filled outermost shells.

Option A

Option B

Option C

Option D

Solution

$(a)$ Lithium $(Li)$, sodium $(Na)$, and potassium $(K)$ have a single electron in their outermost shells.

$(b)$ Magnesium $(Mg)$ and calcium $(Ca)$ have two electrons in their outermost shells.

$(c)$ Neon $(Ne)$, argon $(Ar)$, and xenon $(Xe) $ have filled outermost shells.

Standard 10

Science

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