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Across
3.a theory that all matter is made of tiny units called atoms
4.is an outer shell electron that is associated with an atom
5.the number of atoms or molecules in one mole of a substance that equal to 6.023 × 1023.
6.reactivity to other chemical is a type of
7.a table display full of the chemical elements
8.characteristic of a substance that is observed during a reaction
10.to find this you add the # amount neutrons and atomic mass
13.characteristic of matter that can be observed and measured without changing the chemical identity of the sample.
17.a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.
20.two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons
21.the mass of a given chemical element or chemical compound divided by the amount of substance.
22.an atom with a negative chart
Down
1.a way chemists and other scientists convert units of measurement.
2.an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
9.the mass of an atom of a chemical element expressed in atomic mass units.
11.a measure of the amount of matter in an object.
12.a fundamental interaction of nature that acts between subatomic particles of matter.
14.an atom with no type of charge
15.their size and how they are arranged determines there
16.a atom with an positive charge
18.the outside part of an atom around the atomic nucleus.
19.the basic unit of a chemical element.

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