Question

An element 'X' belongs to group 17.
(a)Write its valency and valence e electron
(b)Mention its formula with alkali metal sodium
(c)Compare its size with oxygen
Q.10)Out of group one and group two, which group has
a) high ionization enthalpy
b) smaller size​

Answer 1

Answer:

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Answer 2

(a)The valency is1

The valence electron is 7.

(b) Formula is NaX

(c)The atomic of X element is bigger than oxygen.

Q10)

(a)Group 1

(b)Group 1

hope it help