Q18 of 52 Page 38

Arrange the following elements in the order of their increasing nonmetallic character: Li, O, C, Be, F

Non-metallic character increases on going from left to right in a period. This is due to decreased atomic size which increases the tendency of an element to gain electrons. Non-metallic character decreases on moving down a group.

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16

Which of the following are the characteristics of isotopes of an element?

(i) Isotopes of an element have same atomic masses.


(ii) Isotopes of an element have same atomic number.


(iii) Isotopes of an element show same physical properties.


(iv) Isotopes of an element show same chemical properties.

 17

Arrange the following elements in the order of their decreasing metallic character: Na, Si, Cl, Mg, Al

 19

What type of oxide would Eka–aluminium form?

 20

Three elements B, Si and Ge are