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ICSE Class 10 Chemistry Question 14 of 25

Periodic Table, Periodic Properties and Variations of Properties — Question 10

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Question

Question 8

What do you understand by ?

(i) Periodicity

(ii) Typical elements

(iii) Orbits

Answer

(i) The properties that reappear at regular intervals, or in which there is gradual variation (i.e. increase or decrease) at regular intervals, are called 'periodic properties' and the phenomenon is known as the periodicity of elements.

(ii) The third period elements are typical elements. They are Sodium (Na), Magnesium (Mg), Aluminium (Al), Silicon (Si), Phosphorus (P), Sulphur (S), Chlorine (Cl) .

(iii) Electrons revolve around the nucleus in certain definite circular paths called orbits.