1. Metals / Non Metals, Metalloids, Halogens & Noble Gases

2. Metal A metal is a material or an element, compound, or alloy that is typically hard, opaque, shiny, and has good electrical and thermal conductivity.

3. Non-Metal Is a chemical element that mostly lacks metallic attributes. Physically, nonmetals tend to be highly volatile (easily vaporized), have low elasticity, and are good insulators of heat and electricity; chemically, they tend to have high ionization energy and electronegativity values, and gain or share electrons when they react with other elements or compounds.

4. Metalloids I s a chemical element with properties in between, or that are a mixture of, those of metals and nonmetals.

5. Halogens Are a group in the periodic table consisting of five chemically related elements: Fluorine (F) Chlorine (Cl), Bromine (Br), Iodine (I), and Astatine (At).

6. Noble Gases Make a group of chemical elements with similar properties. Under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity. The six noble gases that occur naturally are: Helium (He) Neon (Ne) Argon (Ar), Krypton (Kr), Xenon (Xe), and The radioactive radon (Rn) Ununoctium (Uuo) was recognized as an element in December 2015, is predicted to be a noble gas as well but this fact is not confirmed.

7. How Are Elements Grouped