Your qiuestion cannot be answered as stated. Please explain and submit again.
Because they are both multiples of two, so when they're added, the sum must be another multiple of two. (One group of twos plus another group of twos must be a new group of twos, just like one group of cows plus another group of cows must be a new group of cows.)
Carbonate has a negative two charge (CO32-). Group 1 elements have a plus 1 charge, and group II elements have a plus 2 charge. In order balance the reaction so that the charge is balanced, the stoichiometry comes out 1 to 2 for Group 1 and 1 to 1 for the Group II.See the Related Questions for more information about balanced reactions and stoichiometry.
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Two atoms of a Group 17 element would be needed to react with one atom of a Group 2 element because Group 17 elements have a valency of 1, while Group 2 elements have a valency of 2. This means that for the two elements to form a stable compound, they need to share electrons in a 1:2 ratio.
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Any two persons can get married. So yes.
normally they have "o" plus or negative.
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No. The child will be either group A or group B, but not group O. This is because the father can donate only a group A gene or a group B gene, so since group A and group B are dominant over group O, the child could not have group O blood.
branch-based group including the crown group plus the stem group.
of course.