Question

define the following terms ;element ,atom, compound and molecule

Answer 1

Element- In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by chemical means.

Atom- An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.

Compound- A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) composed of atoms from more than one element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound.

Molecule- A molecule is defined as two or more atoms of the same element different element that are bound together. A molecule may be homonuclear, which means, it consists of atoms of one chemical element, as with oxygen (O2); or it may be heteronuclear, a chemical compound composed of more than one element, as with water (H2O).

Answer 2

Answer:

Element: an element is a pure substance consisting only of atoms that all have the same numbers of protons in their atomic nuclei.

Explanation:

Atom: An atom is the smallest unit of ordinary matter that forms a chemical element.

Compound: Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements.

Molecule: a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.