Year 9 Flashcards
Protons, neutrons and electrons relative mass
P: 1, n:1, e: 0
Relative charge of protons neutrons and electrons
P: positive 1, n: 0, e: negative 1
What did dalton do (history of periodic table)
Ordered elements by mass
What did newlands do?
Put the elements in periods of 8
What did Mendeleev do?
He left gaps for undiscovered elements
What did Moseley do?
He ordered them by atomic number
Jj Thomson
Plum funding model
Rutherford model
Nuclear model
Niels Bohr
Energy level model
James Chadwick’s model
Neutrons
Alkali metals
Elements in group 1
Group 7 is also known as…
Halogens
Noble gases
Is group 0
Displacement reaction
More reactive element takes the place of a less reactive compound
Transition metals
Elements from the central block of the periodic table
Compound
2 or more elements chemically bonded together
Atom
The smallest particle of an element
Molecule
2 or more atoms chemically bonded together
Element
A substance made up of only 1 type of atom
Mixture
2 or more substances mixed together but not bonded and don’t react
Isotope
Atoms of the same element but with different numbers of neutrons
The 5 separation techniques
- Filtration: Using a filter to separate an insoluble solid from a liquid.
- Crystallisation: The liquid (solvent) evaporates away leaving the soluble solid crystals (solute) behind.
- Simple distillation: Separates a liquid from a solution. The solution is heated, it evaporates and then condenses for collection.
- Fractional distillation: Separates multiple liquids from a solution, based on boiling points.
- Chromatography: separating soluble substances from one another.
Where r protons and nuetrons found
In the nucleus
What did Niels Bohr discover
Energy shells and the electrons orbit in fixed distances from the nucleus
