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CHEMISTRY [3 Mark Question Answer]

Atoms, Molecules and Radicals · ICSE STD 7 (ICSE - English Medium). 2 questions.

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[3 Mark Question Answer]

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Question 13 Marks
What do you understand by the following terms valency, valence electrons and valence shell?
Answer
1. Valency - The capacity of the atom of an element to form chemical bonds.
2. Valence electrons - The electrons present in the valence shell are called valence electrons.
3. Valence shell- The outer most shell of an atom is known as its valence shell.
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Question 23 Marks
 Give the charge and the mass of an electron, proton and neutron present in an atom ?
Answer
Particle   Charges  Mass
(1) proton Positive  One atomic mass unit.         (amu)
(2)electron Negative  1/1837 times the mass of one hydrogen atom.
(3)Neutron  No charge  One atomic mass unit, equal to mass of proton. 
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[3 Mark Question Answer] - CHEMISTRY STD 7 Questions - Vidyadip