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Sub-Atomic Particles

An element X ...

Question

An element X has 3 electrons in its third shell. Fill in the following details.

Electronic Configuration

Atomic Number

Name

Symbol

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Solution

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Q. What do you understand by the term "electronic configuration" of an element? Write down the electronic configuration of oxygen (At. No. = 8).
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?

Q. The atom of an element X has 7 electrons in its M shell.

(a) Write the electronic configuration of element X.

(b) What is the atomic number of element X?

(c) Is it a metal or a non-metal?

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Q. An atom has 2 electrons in the first (K)shell, 8 electrons in the second (L) shell and 2 electrons in the third (M) shell. Give its electronic configuration and find out the following:-
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2.Total number of principal quantum numbers
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Q. an atom of an element has 3 valanced electrons in the third cell.write the electronic configuration of the atom and identify it.

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