Question

How many electrons, protons and neutrons will be there in an element 19x9 ? what will be the valency of the element?

Answer 1

Given:

Element 19×9

To find:

Number of electrons, protons, neutrons and Valency.

Solution:

• The information given about the element is 19×9. It means that 19 is the atomic mass whereas 9 is the atomic number of the element.
• The element with atomic number 9 is fluorine. The number of sub-atomic particles present in Fluorine is as follows:

Number of Protons = Number of Electrons = Atomic number  

∴ Atomic number of Fluorine = 9

Number of protons = 9

Number of Electrons = 9

Number of neuton = Mass number - Atomic number

∴ Mass number of Fluorine = 19, Atomic number =9

Number of neutron = 19 - 9 = 10

• As fluorine has 9 electron, the electronic distribution is 2,7. There are seven valence electron present in the outermost shell.
• As valence electron is above 4, therefore valency is 1 (Valency = 8-valence electron).

Conclusion:

Number of electrons = 9

Number of protons = 9

Number of Neutrons = 10

Valency of the element = 1

Learn more about suhc concept

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Answer 2

Explanation:

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