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WHSCHEM1ATOMS

jrector

WHSCHEM1ATOMS

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Across
3.A positively charged particle.
5.Credited with the discovery of the neutron.
7.Used the now famous "gold foil" experiment to prove the existence of the nucleus. He also showed most of an atom is empty space!
9.An orderly arrangement of the elements known to man.
13.Total number of protons and neutrons in the nucleus. (2 Words)
15.Credited with the earliest idea of atoms existing. He was a Greek philosopher.
17.A substance that cannot be separated into simpler substances by chemical means.
18.Positively charged subatomic particle which is located in the nucleus.
19.Vertical columns on the periodic table.
20.A negatively charged particle.
21.An electron of an atom, located in the outermost shell.
Down
1.This part of the atom houses protons and neutrons.
2.The smallest particle of an element that retains the properties of that element.
4.Has the same mass of a proton, but unlike the proton, has no charge.
6.The number of protons in the nucleus of an atom for that element. (2 Words)
8.Subatomic particle that has a negative charge and orbits the nucleus.
10.Credited with the "planetary" model of the atom that shows electrons orbiting the nucleus.
11.A pure substance made up of two or more elements.
12.Credited with the discovery of the electron and the "plum pudding" model of the atom.
14.Credited with the development of an early atomic theory to explain the behavior of atoms.
16.Atoms that are electrically neutral and belong to the same element, but have different mass numbers.

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