Atom - nuclear

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1.
atoms of same element with different atomic mass
2.
subatomic particle with positive charge
3.
subatomic particle with neutral charge
4.
subatomic particle with negative charge
5.
said atom was an indivisible sphere. Cannonball model
6.
discovered electrons. Cookie dough model
7.
said atom was mostly empty space. Gold foil experiment.
8.
said electrons travelled in orbitals.
9.
model that shows electrons in their possible location.
10.
identity of element. Number of protons.
11.
protons + neutrons
12.
two small nuclides combine to form a larger nuclide.
13.
a large nuclide split apart into smaller pieces
14.
a nuclide change to a different nuclide by releasing a particle
15.
time needed for half of a sample to decay
16.
particle with mass of 4. High ionizing power
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particle that is basically an electron
18.
radiation with high penetrating power
19.
weighted average of all isotopes of an element
20.
particles of an atom. Protons, neutrons, electrons.