The electronic configuration of element X is K, L, M
2, 8, 2
What is the period number of element X?

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Solution

Period number is equal to the number of shells of an atom.
Element X contains 3 shells, therefore, it belongs to the 3rd period.

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The electronic configuration of element X is K, L, M

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An element A atomic number 7 mass number 14

B electronic configuration 2, 8, 8

C electrons 13, neutrons 14

D Protons 18 neutrons 22

E electronic configuration 2, 8, 8, 1

State (i) valency of each element (ii) which one is a metal (iii) which is a non-metal (iv) which is an inert gas.

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