Question

what is the different between the molecules of elements and compounds ( short note)​

Answer 1

A chemical element is a pure substance that consists of one type of atom. Each atom has an atomic number, which represents the number of protons that are in the nucleus of a single atom of that element.

The periodic table of elements is ordered by ascending atomic number.The chemical elements are divided into the metals, the metalloids, and the non-metals. Metals, typically found on the left side of the periodic table, are:

Pure chemical elements are not considered chemical compounds, even if they consist of diatomic or polyatomic molecules (molecules that contain only multiple atoms of a single element, such as H2 or S8).

Chemical compounds have a unique and defined structure, which consists of a fixed ratio of atoms held together in a defined spatial arrangement by chemical bonds. Chemical compounds can be:

Answer 2

$\text\color{fuchsia}{Molecules of elements and compounds}$

⇝ The molecules of an element, are by definition, all composed of the same atoms ( for example: O2, or oxygen). They share “ molecular bonds” ( which means they are bonded, by sharing electrons between them). In this case, two oxygen atoms are bonded into an oxygen molecule, by sharing electrons.

⇝ The molecules of a compound, are made up of different atoms, that also share molecular bonds ( by sharing electrons). Even though they are different elements ( for example: H2O, or water, is two hydrogen atoms bonded by sharing electrons, with one oxygen atom).

⇝ However, it is possible to have a compound, made of different atoms held together by ionic bonds, not molecular bonds. Therefore, while it a compound, it is not a compound molecule ( as there are no molecular bonds)! Ionic bonds occur, when one atom completely gives up electrons to another different atom ( as in NaCl, or sodium chloride, otherwise known as salt).

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