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Periodic Classification Of Elements
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09/09/2021 2:13 pm
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(i) three elements that have a single electron in their outermost shells.
(ii) three elements that have two electrons in their outermost shells.
(iii) three elements with filled outermost shells.
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09/09/2021 2:14 pm
(i) Lithium, sodium, potassium (alkali metals)
(ii) Beryllium, magnesium, calcium (alkaline earth metals)
(iii) Helium, neon, argon (noble gases).