PERIODIC CLASSIFICATION

The number of periods and groups in the

periodic table are______.

• 6,16

• 7,17

• 8,18

• 7,18

_____ group contains the member of

halogen family.

• 17th

• 15th

• 18th

• 16th

Chemical formula of rust is ________.

• FeO.xH₂O

• FeO₄.xH₂O

• Fe₂O₃.xH₂O

• FeO

If the distance between two Cl atoms in Cl2

molecule is 1.98Å, then the radius of Cl

atom is ________.

• 0.99 Å

• 0.09 Å

• 0.90 Å

• 0.98 Å

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

Octaves

• Octaves

• Triad

• Metals

• Non-Metals

Cl, I if these are the Dobereiner’s triad and the atomic masses of chlorine and the Iodine are 35,5 and 127 respectively. The atomic mass & the particular element is?

• Ar, 40

• F,19

• Br, 81.25

• At, 210

What happens to the electropositive character of elements on moving from left to right in a periodic table?

• Increases

• Decreases

• First increases than decreases

• First decreases than increases

The electronic configuration of an element M is 2, 8, 4. In modern periodic table, the element M is placed in

• 4 group

• 2 group

• 14 group

• 18 group

Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine and nitrogen?

• O < F < N

• N < F < O

• O < N < F

• F < O < N

Tags

NGSS.HS-PS1-1

An element M is in group 13^th of the periodic table, the formula for its oxide is

• MO

• M₂O₃

• M₃O₂

• None