solve question 1,2 ,3
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1) calcium
CaHCO3
CaCO3
CaP
2) electronic configuration
M 2 8 5
X 2 4
3) A sodium
B calcium
CaHCO3
CaCO3
CaP
2) electronic configuration
M 2 8 5
X 2 4
3) A sodium
B calcium
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