Matter
Made up of only one substance with the exact same properties
What is a pure substance
Metals, Metalloids, Non-metals
What are the three groups of elements
Group 1, super reactive, 1 electron in the outer shell, soft and silvery and conducts electricity
What is Alkali Metals
Made up of 2 or more substances - can be broken down physically
What is a mixture
Elements found LEFT of the staircase
What is a metal
Group 2, is less reactive than group 1, white and malleable and conducts electricity
What is Alkaline Earth Metals
Made up of 2 atoms - can only be broken down chemically
What is a compound
Elements found on the RIGHT to the staircase
What is a non-metal
Group 17, 7 electrons in the outer shell, very reactive - not found in nature
What is Halogens
A mixture in which you can differentiate the different particles
What is a heterogeneous mixture
Elements found ON the staircase
What is a metalloid
Group 18, colourless, does not react and found in Earth's atmosphere
What is Noble Gases
A mixture in which you cannot differentiate the different particles
What is a homogeneous mixture
Made up of protons, neutrons and electrons
What is an atom
First element, is unique, is a gas and only needs 2 electrons to be full
What is Hydrogen