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#reactivity #ion #+2 charge #cation #group 2 #valence electrons

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#group 1 #group 2 #team 1 #team 2 #teams

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#flame test #spectroscopy #strontium #barium #calcium #group 2

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#group 1 #group 2 #team one #team two #numbered groups #squads #participants #first team #second team

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#group 2 #team 2 #section 2 #pangkat dalawa #unit 2

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#squad 2 #team 2 #group 2 #shield 2 #section 2

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#group 2 #alkaline #s block