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