GEOL 101 Lecture Notes - Lecture 3: Magnetite, Atomic Mass (Band), Anhydrite
11 Jan 2017
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Document Summary
Atoms are the basic building blocks of matter that make up everyday objects. Nucleus at center of atom contains must of the mass (protons and neutrons) Negatively charged electrons surround the nucleus forming on or more shells. Protons are positively charged and 1800 times more massive than electrons. Neutrons are not charged but just as massive as protons. Atomic number a = # of protons (defines element"s name) Atomic mass z = a + # of neutrons. Atoms with same a but different z are called isotopes. Electrons orbit around the nucleus in discrete shells. Chemical bonding involves only electrons in the outermost, valence, shell. All atoms of any given elements are identical and they combine into chemical compounds in definite proportions john dalton. Cations are positively charged due to loss of an electron. Tend to have their electron shells pulled inward. Anions are negatively charged due to gain of an electron. Tend to have their electron shells expanded outward.
