PERIODIC CLASSIFICATION

Front

The number of periods and groups in the periodic table are: 6,16; 7,17; 8,18; 7,18.

Back

7,18

Front

Which group contains the members of the halogen family? Options: 17th, 15th, 18th, 16th

Back

17th

Front

Chemical formula of rust is ________.

Back

Fe₂O₃.xH₂O

Front

Distance between two Cl atoms in Cl₂ molecule is 1.98Å. What is the radius of a Cl atom?

Back

0.99 Å

Front

Dobereiner tried to arrange the elements with similar properties into group. So, he called the groups “_______”

Back

Triad

Front

Cl, I if these are the Dobereiner’s triad and the atomic masses of chlorine and iodine are 35.5 and 127 respectively. What is the atomic mass & the particular element? Options: Ar, 40; F, 19; Br, 81.25; At, 210.

Back

Br, 81.25

Front

What happens to the electropositive character of elements on moving from left to right in a periodic table? Options: Increases, Decreases, First increases then decreases, First decreases then increases

Back

Decreases

Front

Electronic configuration of element M is 2, 8, 4. In modern periodic table, which group is element M placed in? Options: 4 group, 2 group, 14 group, 18 group.

Back

14 group

Front

Order the atomic radii of oxygen, fluorine, and nitrogen.

Back

F < O < N

Front

An element M is in group 13^th of the periodic table, the formula for its oxide is: MO, M₂O₃, M₃O₂, None

Back

M₂O₃