Atoms
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What is matter
Anything that has mass and takes up space
What is matter made of
Small particles called atoms
What is atom dirivwd from
The Greek word atomos which means invisible
Subatomic particles?
Smaller particles that make up an atoms
What particles make up an atom (3)
Protons Neutrons Electrons
What two types of particles that make up the central region of a nucleus
Protons: have a mass carry positive charge Neutrons: don’t carry a charge said to be neutral
What are electrons (4)
They are subatomic particles that are negatively charged. Very fast moving particles. Have large amounts of energy
How are electrons held around the nucleus
By the positive charge of the protons in the nucleus
What happens if the number of protons in an atom equals the number of electrons
The atom has no overall charge. It’s neutral
Describe what an atom looks like
The outer shell is electrons there are two layers both are electrons and the inner circle is the nucleus which is made up of the protons and neutrons
How many elements are there that make up matter on earth
118 elements
An element?:(4)
Is made up of atoms of some kind Cannot be changed into element by means of a chemical reaction Is a substance that can’t be broken down into two or more substances by chemical means Has atoms which contain protons neutrons and electrons
Periotic table?:
Groups=down/rows Periods=left to right/columns
Different types of groups
Pink=noble gas Brown= metalloids Grey\light brown= non metals Orange= halogens Light purple= other metals Light blue=alkaline earth metals Dark blue=alkali metals Yellow=transition metals Dark green=lanthanoids Light green=actinoids White=properties unknown
Abbreviations and meaning
Eeee
H
Hydrogen
Be
Berylium
B
Boron
C
Carbon
N
Nitrogen
O
Oxygen
F
Flourine
He
Helium
What are elements
Substances that we can’t break down further into simpler substances