BI SC 004 Lecture Notes - Lecture 1: Ionic Bonding, Chlorine
Document Summary
Life on earth is made of chemical elements. All objects in the universe are made up of matter. Matter consists of one or more elements. Approximately: 25 elements are essential to life. Matter is anything that: has mass, takes up space. Elements are the basic building blocks of matter that: cannot be broken down by chemical means. Atoms are the smallest units of an element that: retain the element"s properties. Neutrons and protons make up the nucleus. Electrons: negatively charged, orbit around the nucleus. Made of atoms that are bonded together. Can be made of: the same atom, different atoms. Atoms that form molecules can form bonds in different ways. Atoms in this type of bond either: donate electrons, accept electrons. Results in a stable outer valence shell. Atoms in this type of bond share electrons. Result in a stable outer valence shell.
