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What is the same about the electron structures of
a. Lithium, sodium and potassium.
b. Beryllium, magnesium and calcium.
a. Lithium, sodium and potassium have electron in their outermost shell.
Similarly,
b. Beryllium, magnesium and calcium are lie in the same group of the periodic table and all of them have electrons in their outermost shell.
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