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I. Graham

The history of the atom and terms of atomic structure

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2.credited with the discovery of the neutron
4.negatively charged subatomic particles
6.the simplest substances which cannot be broken down using chemical methods
7.houses protons and neutrons
8.Greek philosopher credited with the earliest idea of atoms existing
10.credited with the planetary model of the atoms that shows electrons orbiting the nucleus
14.the number of protons and neutrons (2 Words)
16.credited with the development of an early atomic theory to explain the behavior of atoms
17.credited with the discovery of the electron and the plum pudding model of the atom
18.any atom or group of atoms with a negative charge
19.subatomic particles with no charge
20.the horizontal rows of a periodic table
1.Used the "gold foil" experiment to prove the existence of the nucleus
3.indicates the periodic element as well as the number of protons (2 Words)
5.the vertical columns on the periodic table
9.subatomic particle with a positive charge
11.form when atoms or ions join together to form new substances
12.atoms of the same element that have a different number of neutrons.
13.any atom or group of atoms with a positive charge
15.the number of electrons need to fill the outermost level of an atom
18.smallest particle of an element that retains the properties of that element

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