An atom of an element X has two completely filled shells, the no: of electrons in 1 st
and 3rd shells are equal. Third shell is the valence shell. (1)
a) Find the atomic number of X
b) Identify the element and Write the formula of its bicarbonate
c) Find the no of electrons in X
d) Write its electronic configuration
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Answer:
ngle having angle 80° 40° and 60°
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