BIO 202 Lecture 1: Chapter 2 (The Chemical Context of Life)

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Bio 202 lecture 1 - chapter 2: the chemical context of life. Reviewing concepts matter, element, atom, molecule, and compound: matter is anything that has mass, whether it is living or not. Slide 6): molecule is a combined group of atoms. A molecule is called a compound when its atoms are of different elements. Structure of an atom mass number atomic number: atoms comprise of atomic nucleus and electron(s), atomic nucleus is made up of proton(s) and neutron(s), proton is positively charged while neutron does not have charge. Neutron help stabilize the positive charge within the nucleus, therefore stabilizes the atom: electron is lighter in term of mass compared to neutron or proton. The mass of electron is 1/2000 that of proton or neutron. It is also the number of electrons in a neutral atom since #protons = #electrons in a neutral atom. Isotopes and application: the same element with different number of neutrons is called isotope (prof.

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