MSU BIO215 Lecture - Week 02 Objective Assignment

MSU BIO215 Lecture - Week 02 Objective Assignment - BIOL215...

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BIOL215 Lecture Week 02 Objective Assignment Chapter 2: Chemistry Comes Alive Composition of Matter: Atoms and Elements 1. Define chemical element and list the four elements that form the bulk of body matter. A chemical element is a pure chemical substance that consists of one type of atom. There are four elements that make up approximately 20% of the bulk of body matter carbon, oxygen, hydrogen, and nitrogen. 2. Define atom. List the subatomic particles; describe their relative masses, charges, and, positions in the atom. An atom is a basic unit of matter with a dense, central nucleus surrounded by a cloud of negatively charged ions. The subatomic particles of an atom are: a. Electron i. Mass of an electron is 1/2000 the mass of a proton and usually designated 0 amu. ii. Charge of an electron is negative. iii. Position of an electron is on an anatomic orbital. b. Proton i. Mass of a proton is 1 amu. ii. Charge of a proton is positive. iii. Position of a proton is within the nucleus. c. Neutron i. Mass of a neutron is 1 amu. ii. Charge of a neutron is neutral. iii. Position of a neutron is within the nucleus. 3. Define atomic number, atomic mass, atomic weight, isotope and radioisotope. The atomic number of any atom is equal to the number of protons in its nucleus. The atomic mass of any atom is the sum of the masses of its protons and neutrons. The atomic weight is the average of the atomic mass numbers of all the isotopes of an element. Different atomic forms of the same element, varying only by the number of neutrons contained are known as isotopes. A radioisotope is an isotope that exhibits radioactive behavior.
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BIOL215 Lecture Week 02 Objective Assignment Chemical Bonds 1. Explain the role of electrons in chemical bonding and in relation to the octet rule. Electrons are exchanged or shared between two or more atoms and the result is a chemical
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MSU BIO215 Lecture - Week 02 Objective Assignment - BIOL215...

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