KAAP220 Chapter Notes - Chapter 2: Mass Number, Glycogen, Catabolism
14 Sep 2018
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Matter: anything that takes up space and has mass. Mass: the quantity of matter in an object. Atoms: the smallest stable units of matter; composed of subatomic particles. Electrons: much smaller and about 1/1836th the mass of either protons or neutrons, they have a neg electrical charge. Nucleus: of an atom lies at its center; contains one or more protons and may contain neutrons, mass is mainly determined by the numbers of protons and neutrons in the nucleus. Electron cloud: the electrons in the atom around the nucleus that track out a volume of space. Atomic number: the number of protons in the atom. Mass number: total number of both protons and neutrons. Element: a pure substance consisting only of atoms with the same atomic number. Hydrogen (h): the simplest atom, atomic number of 1. Valence shell: the outermost energy level of an atom. Electrons can be transferred or shared with another atom.
