Que-Ans (Each of 3 Mark )

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Complete the following table. Elements Atomic number Mass number Protons Electrons neutrons Electronic configuration Valency Chlorine 17 ___ ___ ___ 18 ___ ___ Silicon ___ 28 ___ 14 ___ ___ ___ Fluorine ___ ___ 9 ___ 10 ___ ___

Vidyadip · Accepted Answer

Elements Atomic number Mass number Protons Electrons neutrons Electronic configuration Valency Chlorine 17 35 17 17 18 2, 8, 7 1 Silicon 14 28 14 14 14 2, 8, 4 4 Fluorine 9 19 9 10 10 2, 7 1 Chlorine atomic number is 17 so protons = electrons = 17 since number of protons/electrons in an atom determine the atomic number. Mass number will be sum of protons and neutrons = 17 + 18 = 35. Since the atomic number is 17 for chlorine so electronic configuration is 2, 8, 7. Valency is 1. Silicon atomic number is 14 = number of electrons/ protons. Since the mass number is 28 so the number of neutrons is a mass number - the number of protons = 28 - 14 = 14. The electronic configuration will be 2, 8, 4 and valency is 4. Fluorine atomic number is 9 = number of protons/ electrons. Mass number is 9 + 10 = 19. Electronic configuration is 2, 7 and valency 1.

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Elements	Atomic number	Mass number	Protons	Electrons	neutrons	Electronic configuration	Valency
Chlorine	17	___	___	___	18	___	___
Silicon	___	28	___	14	___	___	___
Fluorine	___	___	9	___	10	___	___

Structure of the Atom — Science STD 9 — Question

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