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What is an atom?
Atoms are the smallest part of ever substance and they make up all matter
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what are the 3 parts of an atom called?
proton, neutron and electron
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In 1904 JJ thompson said that atoms were like what pudding?
The plum pudding model
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What does the nucleus contain?
proton and neutrons
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what mass is a proton?
1 with a +1 charge
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what mass is a neutron?
1 with a 0 charge
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What mass is an electron?
almost 0 with a -1 charge
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Why don't atoms have an overall charge?
because protons and electrons cancel each other out
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what is an isotope?
An atom with a different number of neutrons but the same number of protons/electrons
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Why does alpha go to towards the negative?
because opposites attract
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why doesn't beta go straight to the positive?
because it has a small mass and it ends at the positive because negatives attract
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Why does gamma go all the way through?
because t has no charge
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what is half life measured in?
different units
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what is half life?
is the time it takes for half the atoms in a sample to decay
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what do nuclear power stations contain?
reactor- boiler-turbine-generator
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What do nuclear fission?
uranium and plutonium
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What is nuclear fission?
process which powers the sun and other stars
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what happens in this process?
small hydrogen nuclei join together to form larger helium nuclei and energy is released
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What is a nebula?
ball of dust and gas pulled together by gravity
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what is a protostar?
it is larger and hotter than a nebula
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What is a main sequence star?
this is where fusion starts (hydrogen+helium)
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what is a red giant?
it expands and cools
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what is a white dwarf?
it contracts and gets hotter
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what is a black dwarf?
its cooler
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What does a red super giant do?
it expands and cools
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What is a supernova?
Explosion
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What is a neutron star?
dense hot dead star
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what is a black hole?
no light escapes
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what are light elements?
formed from the fusion of nuclei in stars
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What are heavy elements?
formed when a massive, ageing star collapses and then explodes as a supernova
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Other cards in this set

Card 2

Front

what are the 3 parts of an atom called?

Back

proton, neutron and electron

Card 3

Front

In 1904 JJ thompson said that atoms were like what pudding?

Back

Preview of the front of card 3

Card 4

Front

What does the nucleus contain?

Back

Preview of the front of card 4

Card 5

Front

what mass is a proton?

Back

Preview of the front of card 5
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