Periodic classification of elements Worksheet-4

Periodic classification of elements Worksheet-4

 

  1. Atom of which of the following element has smallest size?

A. C                     B. Mg                  C. O                     D. S

 

  1. If the valence shell of atom of an element has 7 electrons, the element belongs to the group of_____.

A. Alkali metals                            B. Inert metals

C. Noble gases                               D. Halogens

 

  1. Metallic nature and basic nature of the oxides ........ as we move along a period

A. Increases

B. Decreases

C. First increases then decreases

D. Remains constant

 

  1. In any period the valency of an element with respect to oxygen ____.

A. Increases one by one from IA to VIIA

B. Decreases one by one form IA to VIIA

C. Increases one by one from IA to IVA and then decreases from VA to VIIA one by one

D. Decreases one by one from IA to IVA and then increases from VA to VIIA one by one

 

  1. Which will show maximum non-metallic character?

A. B                     B. Be                   C. Mg                  D. Al

 

  1. Chemical behaviour of an atom is determined by ____.

A. Atomic number                       B. Mass number

C. Binding energy                         D. Number of isotopes

 

  1. Which of the following is a noble gas element?

A. Na                  B. Fe                             C. Li                    D. He

 

  1. The lightest metal is _____.

A. Li                    B. Mg                  C. Ca                   D. Na

 

  1. Of the following pairs, the one containing example of metalloid elements in the periodic table is_____.

A. Sodium and potassium B. Fluorine and chlorine

C. Calcium and magnesium      D. Boron and silicon

 

  1. The number of elements in the longest period in the periodic table is_____.

A. 2                     B. 8                     C. 18                    D. 32

 

Answer Key:

  1. C

Explanation: Size of atom decreases from left to right in a period.

  1. D
  2. B

Explanation: Because of the non-metallic character increases. Oxides of metals are basic in nature and that of non-metals are acidic in nature.

  1. C
  2. A

Explanation: Fact

  1. A

Explanation: Chemical behavior of an atom depends upon the number of valence electrons. Hence the chemical behavior depends upon the atomic number.

  1. D

Explanation: Fact

  1. A

Explanation: Li because of its smallest size.

  1. D

Explanation: Boron and silicon exhibit the properties of both metals and non-metals. Hence they are metalloids.

  1. D