Chemistry standards Free Essay

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Chemistry standards

Atomic and Molecular Structure a. When you move across a period, the atomic number increases. When you move down a group, the atomic number also increases. This puts elements with similar chemical and physical properties in the same area. The atomic mass of an element is the combined number of protons and neutrons in the nucleus. d. Subatomic particles: protons, neutrons, electrons, and other particles that are smaller than atoms. The masses of protons and neutrons are pretty much equal (they are identical to three significant figures). The mass of each particle is 1840 times greater than the mass of an electron. e. Thomsom was credited with the study of cathode rays culminating in the discovery of the electron. Rutherford’s investigatio

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