An atom of an element has two electrons in the M shell. What is the (a) atomic number (b) number of protons in this element ?

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Solution

Since the element has 2 electrons in it s M shell, it’s

Atomic no : 12
Electronic configuration : 2,8,2
Number of protons : 12
Valency : +2
Name of the element : Magnesium

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Atomic Number

Standard IX Chemistry

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An atom of an element has two electrons in the M shell. What is the (a) atomic number (b) number of protons in this element ?

Since the element has 2 electrons in it s M shell, it’s Atomic no : 12 Electronic configuration : 2,8,2 Number of protons : 12 Valency : +2 Name of the element : Magnesium

Since the element has 2 electrons in it s M shell, it’s

Atomic no : 12
Electronic configuration : 2,8,2
Number of protons : 12
Valency : +2
Name of the element : Magnesium