EARTHSS 23 Lecture 1: ESS23 Lecture 1
10 Mar 2017
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Document Summary
Air: a mixture of gas and particles composed of atoms. Pollutants: gases and particles resulting from human activities. Air pollution: buildup in the air of gases and/or aerosol particles, as a result of anthropogenic emissions, in concentrations sufficiently high to cause damage to humans, plants, animals, other life forms, ecosystems, structures, or works of art. Atoms: a nucleus with 1-92 positively-charged protons and 0-146 zero-charged neutrons surrounded by 1-92 negatively charged electrons in orbit around it (theory proposed by niels. Average mass of protons plus neutrons in the nucleus of an atom. Ions: atoms of an element with a different number of protons than electrons (so it has a net electrical charge) Isotopes: atoms of an element with the same number of protons but different number of neutrons (similar chemical characteristics) Periodic table: a way of arranging elements in order of atomic number such that the vertical columns have similar properties.
