Periodic Classification of element

Up to which element,law of octaves found to be applicable

• Oxygen

• Calcium

• Cobalt

• Potassium

According to Mendeleev periodic law, the elements were arranged in the Periodic table in order of

• Increasing atomic number

• Decreasing atomic number

• Increasing atomic mass

• Decreasing atomic mass

In Mendeleev periodic table,gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic table later

• Germanium

• Chlorine

• Oxygen

• Silicon

On moving from left to right in a period in the Periodic table, the size of atom

• Increases

• Decreases

• Does not change appreciably

• First decreases and then increases

Which of the following does not increase while moving down the group of the periodic table?

• Atomic radius

• Metallic character

• Valency

• Number of shell in an element

Which one of the following elements do not constitute a Doebereiner's triad ?

• Cl,Br, I

• Li,Na,K

• S,Se,Te

• N,P,As

The maximum number of elements in the third period is

In the second period of periodic table____________ has the largest size.(excluding noble gases Ne)

Which of the following is the outermost shell for elements of period 2 ?

• K

• L

• M

• N

How many groups present in modern Periodic table ?

• 7

• 18

• 8

• 14