Studied by 1 personWhat is the radius of a atom?
0.1 nanometer (1×10^-10m)
What is the radius of the nucleus?
1×10^-14m
What does the atomic number tell you?
Protons and electrons.
What does the mass number tell you?
Protons + Neutrons
What is an isotope?
Different forms of the same element. (Same number of protons but different numbers of neutron)
How do you work out the relative atomic mass?
ram = sum of (isotope abundance x isotope mass number) // sum of abundances of all isotopes.
What is a compound?
Two or more elements chemically joined. (metal and non metal)
What did John Dalton do?
Said atoms were solid spheres, made up of different elements.
What did J J Thompson do?
Plum pudding model, positively charged ball with negative electrons embedded.
What did Ernest Rutherford do?
Alpha particle scattering experiment, positively charged nucleus in centre.
What does Neil Bohr do?
electrons orbit the atom in shells.
What does James Chadwick do?
neutrons.
What does the group number tell you?
How many electrons are in the outer shell.
Which way do group 1 get more reactive?
down.
What are properties of alkali metals?
soft, low density, low melting and boiling points, higher relative atomic mass.
Which way do group 7 get more reactive?
down.
What are properties of halogens?
higher melting and boiling points, higher relative atomic mass.
characteristics of noble gases’
increase in boiling point as you go down
Note
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