Which has covalent bonds? a) glucose b) table salt c) steel alloy d) iron oxide - rust

- A) glucose has covalent bonds.

Explanations:- Glucose is a molecule that has carbons, oxygen and hydrogen. All these are non metals and do sharing of electrons to gain their nearest noble gas configurations and so glucose has covalent bonds.

Table salt is NaCl. Na is a metal and Cl is a non metal so the bond formed between them is ionic.

Steel alloy has Iron and carbon and so it would have ionic and metallic bonding.

Iron oxide also has a Iron(metal) and oxygen(non metal) and so it has ionic bond.

So, the only and only correct choice is A) Glucose.

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.