Question

An element is represented by symbol 20

40

(i) What is the mass number and atomic number of element X?

(ii) Name its valence shell and number of electrons in the valence shell

(iii) Is the element a metal or a non metal

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Answer 1

Explanation:

(i) Mass number = 40

Atomic Number= 20

(ii) Electronic configuration of atomic number 20 is given by

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2

Hence valence shell will be 2,8,8,2

No of electrons in valence shell= 2 electrons

(iii) It is a metal because it lies in s subshell in periodic table and s block elements are metal and name of the element is Calcium.

Answer 2

Answer:

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