❝ ɴᴀᴍᴇ :
➠ three elements that have a single electron in their outermost shells.
➠ two elements that have two electrons in their outermost shells.
➠ three elements with filled outermost shells.
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♪♥(a) Lithium (Li), sodium (Na), and potassium (K) have a single electron in their outermost shells
♥Magnesium, Calcium, and Strontium are the 3 elements that have two electrons in their outermost orbit
♥Helium and Argon is a noble gas, hence they have filled outermost shell.
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