Question

Which of the first 20 elements in the periodic table are metal and which are non-metals?

Answer 1

Metals: Lithium, Beryllium, Sodium, Magnesium, Aluminum, Potassium, and Calcium

Non-metals: Hydrogen, Helium, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Phosphorus, Sulfur, Chlorine, and Argon

Metalloids: Boron and Silicon

Explanation:

The complete periodic table in this link may help an explanation (click on the link and then on Periodic Table for a better view):
http://www.futurity.org/periodic-table-new-elements-1087782-2/

The elements are grouped into the different substances by color. As you can see, Lithium, Beryllium, Sodium, Magnesium, Aluminum, Potassium, and Calcium are metals out of the first 20 elements.

Hydrogen, Helium, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Phosphorus, Sulfur, Chlorine, and Argon, are non-metals within the first 20 elements.

Boron and Silicon count as Metalloids in the Periodic Table (properties of both metals and non-metals)