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Unformatted text preview: same charge (both positive or both negative) will repel each other. Atoms are neutral. The number of electrons (negatively charged) is equal to the number of protons (positively charged), therefore the overall charge is zero. Atomic Mass and Mass Number The atomic mass is calculated as the sum of the mass of protons, electrons, and neutrons. The mass of electrons is small enough that we can generally disregard it in our calculations of atomic mass. The mass number is the number of protons and neutrons. Most of an atom is empty space. Atomic Number The atomic number is the number of protons. All atoms of an element have the same atomic number. The number of protons contributes to the physical properties of an element. Atoms are neutral, therefore the number of electrons is equal to the number of protons....
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This note was uploaded on 12/15/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.
- Fall '10