Answer:
A Calcium is in group 2
explanation:
because it forms only the Ca 2+ ion. B Dihydrogen phosphate is the H 2PO 4 − ion (Table 2.4 "Common Polyatomic Ions and Their Names"). Two H 2PO 4 − ions are needed to balance the positive charge on Ca 2+, to give Ca(H 2PO 4) 2.
the group number is 2
Explanation:
it is cations
I think the answer is B middle stage
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Direct contact.
Since it was spread through facial tissue, physical contact is needed.
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