There are 2,8 and 7 electrons in the shells K,L and M, respectively. If the mass number of the atom is 37, What is the number of neutrons?

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Solution

We can calculate atomic number by adding the number of electrons in all the shells and then by subtracting it from the mass number, we get the value of number of neutrons.

Mass number: 37
Electronic configuration: 2, 8, 7
So, atomic number will be: 17
[1 mark]

Number of neutrons = Mass number - Atomic number
37 - 17= 20
[1 mark]

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There are 2,8 and 7 electrons in the shells K,L and M, respectively. If the mass number of the atom is 37, What is the number of neutrons? [2 Marks]

There are 2,8 and 7 electrons in the shells K,L and M, respectively. If the mass number of the atom is 37, What is the number of neutrons?

[2 Marks]