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Subatomic Particles Protons, Neutrons, and Electrons in Atoms

6 Subatomic Particles Protons, Neutrons, and Electrons in Atoms [Pg.56]

All atoms are composed of the same subatomic particles protons, nentrons, and electrons. Protons and nentrons, as we saw earher, have nearly identical masses. In SI units, the mass of the proton is 1.67262 X 10 kg, and the mass of the neutron is 1.67493 X 10 kg. A more common unit to express these masses is the atomic mass unit (amu), defined as 1/12 the mass of a carbon atom containing six protons and six nentrons. The mass of a proton or nentron is approximately 1 amu. Electrons, by contrast, have an almost neghgible mass of 0.00091 X 10 kg or 0.00055 amu. [Pg.56]

A sample of matter—even a tiny sample, such as a sand grain—composed of only protons or only electrons, would have extraordinary repulsive forces inherent within it and would be unstable. Luckily, matter is not that way. Table 2.1 summarizes the properties of protons, neutrons, and electrons. [Pg.56]

Each element, identified by its unique atomic number, is represented with a unique chemical symbol, a one- or two-letter abbreviation listed directly below its atomic [Pg.56]

Each element is defined by a unique atomic number (Z), the number of protons in the nucleus of every atom of that element. [Pg.57]




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Atoms and electrons

Atoms particles

Atoms protons

Atoms protons and

Electron proton

Electron protonation

Electrons and proton

Electrons in atoms

Electrons, Protons, and Neutrons

Neutron atoms

Particles electrons

Particles protons

Particles protons and neutrons

Particles, atomic

Subatomic

Subatomic particles Electron

Subatomic particles Electron Proton

Subatomic particles electrons neutrons protons

Subatomic particles neutrons

Subatomic particles protons

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