Chemistry 1a
The smallest part of an element that can exist
What is an atom?
10-10m
What is the radius of an atom?
Atoms with different numbers of neutrons
What is an isotope?
It has isotopes with mass 12, 13 and 14
What is carbon?
What are the alkali metals?
It is because there are the same number of protons and electrons
Why are atoms neutral?
10-14m
What is the radius of a nucleus?
Two or more different atoms chemically combined together
What is a compound?
It has isotopes with mass of 235 and 238
What is a uranium?
They get more reactive as you go up the group
What are the halogens?
Particles with tiny mass and a negative charge
What are electrons?
What is a nanometre?
35.5
What is the mass number of chlorine?
63.5
What is the mass of chlorine?
Elements with a full outer shell
Particles with Mass 1 and Charge 0
What are neutrons?
Also called the atomic number
What is the proton number?
It has a mass number of 12 and a proton number of 6.
What is carbon?
About 120 different ones
How many elements are there?
He put together the 1st proper periodic table
Who was Mendeleev?
Particles with Mass 1 and Charge +
What is a proton?
The number of protons and neutrons
What is the mass number?
The only element without neutrons
What is a hydrogen?
You take the proton number away from the mass number
How do you find the number of neutrons?
He discovered the electron and came up with the plum pudding model (NOT ON SHEET)
JJ Thompson