An element is determined by the number of

The chemical element of an atom is determined by the number of protons, or the atomic number, Z, of the nucleus. The element oxygen has an atomic number Z=8, while carbon has Z=6.

Explanation:

The number of protons determines which kind of element an atom is. If an atom has 8 protons, we can determine this element is oxygen.

Explanation:

In the nucleus of an atom, there are protons and neutrons. Protons have a positive charge and neutrons have a neutral charge. All atoms have at least one proton that determines its atomic number.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;