Question

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Answer 1

(A)

M shell=1

So K and L shells are completely filled

Electronic configuration =2,8,1

(B)

Number of electrons=2+8+1=11

Number of protons = number of electrons

Number of protons=11

(C)

Atomic number=number of protons

Atomic number=11

(D)

Valence electrons=1

Since number of valence electrons is less than 5

So the valency=valence electrons

Valency=1

(E)

Group number=number of valence electrons

Group number=1

(F)

Period number=number of shells

Period number=3

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