12NaBr total Na atoms

12

Explanation:

12NaBr is an ionic compound of Sodium (Na) and Bromine (Br), the question is asking how many total atoms of sodium there are. Because neither of the elements have subscripts, we know that the ratio for the compound is 1:1. This means that there is one sodium atom per NaBr compound. The coefficient, 12, tells us that there are 12 NaBr compounds. If there is one Na atom per compound and 12 compounds, then we know that there must be 12 atoms in total of Na.

- 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

i would say b

explanation:

but i think i would need more information than that