Class test of chemistry

The modern classification of elements is based on the discovery of

• D. I. Mendeleev

• Lord Rayleigh

• Henry Moseley

• Sir Ramsay

Which of the following blocks of elements comprise transition elements?

• S-block

• P - block

• d - block

• f - block

Element with which of the following atomic numbers will be non - metallic in character?

• 12

• 20

• 13

• 16

Choose the correct statement about chemical reactivity of elements along a period and along a group

• Decreases along a group

• Increases along a group

• Increases along a period

• None

With the increase in atomic number in period

• Metallic character decreases

• Metallic character increases

• Chemical reactivity decreases

• Chemical reactivity increases

Which one of the following has the largest size?

• Na

• Mg

• Al

• Si

Which one of the following has smallest size

• Al

• Si

• Cl

• Na

Which of the following is not a Nobel gas?

• Helium

• Xenon

• Radium

• Radon

Which of the following properties generally decreases along a period?

• Atomic size

• Non metallic character

• Metallic character

• Both a and c

The elements of the group 16 are also called

• Halogens

• Noble gases

• Chalcogens

• Alkaline earth metals