In a mixture, . atoms of the substances form molecules

chemical bonding occurs between substances

the substances are combined in a set ratio

each substance keeps its individual properties

D

atoms of the substances form molecules  - this is talking about molecules

chemical bonding occurs between substances  - this is talking about molecules

the substances are combined in a set ratio  - this is talking about molecules

each substance keeps its individual properties - definition of mixture

i'm not sure

explanation:

i'll try whatever you got

- 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