Periodic classification of elements Worksheet-5

Periodic classification of elements Worksheet-5

 

  1. The number of elements in each of the short periods in the periodic table is_____.

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

 

  1. In the long form of the periodic table, all the non- metals are placed in _____.

A. s-block          B. p-block          C. d-bock           D. f-block

 

  1. Elements having 8 electrons in the valence shell are _____.

A. Alkaline earth metals             B. Transition elements

C. Chalcogenes                             D. Noble gases

 

  1. Lithium shows diagonal relationship with

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

 

  1. Element having atomic number 17 is placed in _____

A. I-group          B. V-group        C. VIII-group    D. VII-group

 

  1. The most important active step in the development of periodic table was taken by_____

A. Mendeleef    B. Dalton           C. Avogadro      D. Cavendish

 

  1. Who is called the father of chemistry?

A. Faraday        B. Priestley        C. Rutherford   D. Lavosier

 

  1. The element or elements whose position is anomalous in the periodic table is ____.

A. Halogens                                   B. Fe, Co and Ni

C. Inert gases                                D. Hydrogen

 

  1. The number of elements in the 5th period of the periodic table are ____.

A. 8                     B. 10                   C. 18                   D. 32

 

  1. Atomic number of elements represent ____.

A. Number of protons in the nucleus

B. Number of neutrons in the nucleus

C. Number of protons and neutrons in nucleus

D. The valency of an element

 

Answer Key:

  1. B
  2. B
  3. D
  4. B

Explanation: Elements of second and third period show diagonal relationship.

  1. D

Explanation: 17 – 1s2 2s2 2p6 3s2 3p5

  1. A

Explanation: Mendeleef arranged the elements in tabular form.

  1. D
  2. D

Explanation: It properties are similar to both alkali metals

and halogens.

  1. C
  2. A