Periodic classification of elements Worksheet-5
A. 2 B. 8 C. 18 D. 32
A. s-block B. p-block C. d-bock D. f-block
A. Alkaline earth metals B. Transition elements
C. Chalcogenes D. Noble gases
A. Al B. Mg C. Be D. B
A. I-group B. V-group C. VIII-group D. VII-group
A. Mendeleef B. Dalton C. Avogadro D. Cavendish
A. Faraday B. Priestley C. Rutherford D. Lavosier
A. Halogens B. Fe, Co and Ni
C. Inert gases D. Hydrogen
A. 8 B. 10 C. 18 D. 32
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:
Explanation: Elements of second and third period show diagonal relationship.
Explanation: 17 – 1s2 2s2 2p6 3s2 3p5
Explanation: Mendeleef arranged the elements in tabular form.
Explanation: It properties are similar to both alkali metals
and halogens.