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Chemistry Chap. 3

Atoms and Molecules

QuestionAnswer
Did many people believe in the Atomic Theory? No.
Law of Definite Proportions The law that states that a chemical compound always contain the same elements in the exactly the same proportions by weight or mass.
Law of Conservation of Mass The law that states that mass cannot be created or destroyed in ordinary chemical and physical changes.
Law of Multiple Proportions The law that states that when two elements combine to form two or more compounds, the mass of one element that combines with a given mass of the other is in the ratio of small whole numbers.
Electron A subatomic particle that has a negative electric charge.
Nucleus An atom's central region, which is made up of protons and neutrons.
Protons A subatomic particle that has a positive charge and that is found in the nucleus of an atom; the number of protons of the nucleus is the atomic number, which determines the identity of an element.
Neutrons A subatomic particle that has no charge and that is found in the nucleus of an atom.
Atomic Number The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element.
Mass Number The sum of the numbers of protons and neutrons of the nucleus of an atom.
Isotopes An atom that has the same number of protons (atomic number) as other atoms of the same element but has a different number of neutrons (atomic mass).
Created by: Niahanaziwi