Atomic Structure and Basic Ideas (Atoms (In an element on the periodic…
Atomic Structure and Basic Ideas
Neutrons have a neutral charge and are found in the nucleus. It has a mass of 1.
Electrons are found in electron shells around the atom. Electrons have a negative charge and do not weigh enough to affect the weight of the atom.
In an element on the periodic table, the atomic mass is the top number and is the how many protons and neutrons are in the nucleus. The bottom number is the atomic number (proton number) this shows how many protons there are.
Atoms contain protons, neutrons and electrons
Atoms have a diameter of 0.1 nano-metres
When elements react with other elements, atoms combine with other atoms to form compounds.
An element is a substance that is made up of atoms. The atoms in the element all have the same number of protons in the nucleus.
Protons are found in the nucleus of an atom and have a positive charge. It has a mass of 1.
History of the atom
Niels Bohr came up with a slightly different 'Nuclear Model'. His showed electrons in shells. The electrons were a set distance away from the nucleus.
Ernest Rutherford then proved the 'Plum Pudding Model' wrong.
Further experiments showed smaller particles in the nucleus, protons.
Rutherford came up with the 'Nuclear Model'
John Dalton described atoms as solid spheres.
He later realised that atoms have charge and mass. So he invented the 'Plum Pudding Model'. The 'Plum Pudding Model' showed a positively charged plum pudding with electrons sticking out of it.
Putting a mixture of different substances/components into at solution. The solution will carry some of the molecules further up the chromatography paper than it will the others (A mixture of components)
Heating a liquid until it turns into a gas and then condensing it back into a liquid. The liquid will have two different boiling point so the can be separated (Liquid from a liquid)
The solidification of atoms or molecules to separate two substances (Dissolved solid from a liquid)
Separating small particles (dirt) from a liquid using filter paper (Solid from a liquid)