-fired alpha particles at gold foil
-most nuclei passed straight through
-a few nuclei rebounded
RESULTS= small concentration of mass in the Centre of ana atom but mostly empty space
9 of 15
what is the maximum number of electrons per shell
1st=2
2nd=8
3rd=8
10 of 15
what are elements with full outer shells?
stabe- INHERT
this means they will not react
11 of 15
how do group 1 react to form molecules and gain stability?
they lose 1 outer electron; this makes them very reactive; they form a positive ion
12 of 15
how do group 7 react to form molecules and gain stability?
they gain 1 outer electron; this makes them very reactive; they form a negative ion
13 of 15
what is relative atomic mass
The relative atomic mass is the average mass of an element, weighted according to the abundance of its isotopes, on a scale where carbon-12 has a mass of 12.
14 of 15
what is an ion
when atoms gain or lose an electron to create a full outer shell
15 of 15
Other cards in this set
Card 2
Front
what is the radius of an atom and a nucleus of an atom?
Back
Atom- 1x10
Nucleus- 1x10
Card 3
Front
how do you work out the relative atomic mass of an atom
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