Q9 of 60 Page 138

Name the most reactive element present in group 17.

Fluorine is a most reactive element in group 17 because of its small size and high electronegativity by which it accepts electron easily and forms a bond with another element.


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7

Element X with atomic number 12 and Y atomic number 17 reacts with hydrogen to form hydrides. Which of them is expected to have a high melting point?

 8

An element X has E.C. = 2, 8, 8, 1 while Y has 2, 8, 7. Which of these is a metal?

 10

Give the formula of oxide formed by a metal if it belongs to the 3rd period and 13th group.

 11

What similarity do you observe in:

(i) Elements belonging to the same period.


(ii) Elements belonging to the same group.