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6 The elements in Group 2 have similar chemical properties because each atom or these elements has the same

(1) atomic number

(2) mass number

(3) number of electron shells

(4) number of valence electrons

Verified Answer :

Nellz01

They have similar chemical properties because their atoms have the same number of electrons in the highest occupied energy level. So the answer is 4.
Hope this helps! :-)

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