What effect does the presence of an extra neutron have on the chemical properties of new atoms formed?

Well, adding an extra neutron will create a new isotope of the element

This will change the nuclear properties of the atom , but it pretty much won't make any effect on its chemical properties

hope this helps

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.

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