Cho các nhóm sau: Carboxyl (1), Ceton (2), Methyl (3), Phenyl (4), Aldehyd (5), Hydroxyl (6) Câu 1. Sắp xếp độ hòa tan giảm dần các nhóm. Thứ tự đúng sẽ là: A. (1)>(3)>(5)>(6)>(2)> (4) B. (3)>(1)>(5)>(6)>(2)> ( C. (1)>(2)>(5)>(6)>(3)> (4) D. (1)>(6)>(5)>(2)>(4)> (

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

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answerspecific gravity;

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explanation:

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