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secondary 3 | Biology
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chemistry ! please help
Date Posted: 5 years ago
Views: 340
21 is A
22 i think is C. Look at periodic table. Calcium At is 40, Magnesium Mr is 24. Look at proton number also. Look at bonding, sld be the same. Ionic - ionic, covalent - covalent.
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Answer C
Q and S same group
Q and S same group
Date Posted:
5 years ago
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