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Q. 19.     Complete the following table.

                

Answers (1)

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First row:

atomic number =  9

so, the element is Fluorine.

Atomic no. = No. of protons = no. of electrons = 9

Mass number = no. of protons + no. of neutrons = 9 + 10 = 19

Second row:

Since atomic no. is 16 so, no. of protons = no. of electrons = 16

No. of neutrons = Mass no. - no. of protons = 32 - 16 = 16

Third row:

No. of protons = Atomic no. = 12

So, the element is Magnesium.

No. of electrons = no. of protons = 12

No. of neutrons = Mass no. - no. of protons = 24 - 12 = 12

Fourth row:

No. of protons = Atomic no. = 1

So, the element is Deuterium.

No. of electrons = no. of protons = 1

No. of neutrons = Mass no. - no. of protons = 2 - 1 = 1

Fifth row:

No. of protons = Atomic no. = 1

The element is Protium since the mass number is 1.

So the Table becomes,

Atomic number

 mass number Number of neutrons Number of protons Number of electrons

Name of the element
9 19 10 9 9 Fluorine
16 32 16 16 16 Sulfur
12 24 12 12 12 Magnesium
1 2 1 1 1 Deuterium
1 1 1 1 0 Hydrogen ion

 

Posted by

Pankaj Sanodiya

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