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which of the following chemical formulas shows a covalent compound?

nacl

hbr

mgo

co2

Explanation:

A covalent compound is generally formed by non-metals.

For example, in HBr compound both hydrogen and bromine are non-metals. Whereas in compound also both carbon and oxygen atoms are non-metals.

For example, NaCl and MgO are both ionic compounds.

An ionic compound is always formed between a metal and a non-metal.

Thus, we acn conclude that out of the given options HBr and chemical formulas shows a covalent compound.

- 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

these nuts