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The Atom

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6.opposite charges ____ each other
7.number of protons in an atom
9.space surrounding the nucleus
11.positive charged particle
12.An atom with mass number 75 and 44 protons would have how many neutrons [spell out number]
13.discovered electrons
17.all the radiaoctive decays an element goes through to become stable
19.splitting a Uranium nucleus to release energy
20.decay that releases only energy; no particles
22.negative particle
23.atoms of the same element with different mass numbers
24.an electron form a nuclear decay is a ____ particle.
25.alpha radiation is easily stopped by this material
1.___ and ___ were the first two atomic bombs
2.joining 2 hydrogen nuclei to form a helium nucleus
3.like charges _____ each other
4.discovered the nucleus
5.used to control the rate of reaction in a nuclear power reactor
8.neutral particle
10.A particle of 2 protons and 2 neutrons
14.protons and neutrons combined
15.time required for 1/2 of a radioactive sample to decay
16.discovered radioactivity
18.small, dense and solid
21.smallest particle of matter that retains properties

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