Chapter 3 vocab

Question Answer
Law of conservation of mass The law that states that mass cannot be created or destroyed in ordinary chemical and physical changes.
Law of definite proportions The law that states that a chemical compound always contains the same elements in exactly the same proportions by weight or mass
Law of multiple proportions 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 while number
Atom The smallest unit of an element that maintains the chemical properties of that element.
Nuclear forces The interaction that binds protons and neutrons, protons and protons, and neutrons and neutrons together in a nucleus
Atomic number The number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element
Isotope
Mass number
Nuclide
Atomic mass unit
Average atomic mass
Mole
Avogadroa??s number
Molar mass
Atom that has the same number of protons but different number of neutrons.
Sum of the protons and neutrons
An atom that is identified by the number of protons and neutrons in its nucleus
A unit of mass of an atom or molecule
The weighted average of the masses of all naturally occurring isotopes of an element
The SI base unit used to measure the amount of a substance whose number of particles is the same as the number of atoms of carbon in exactly 12g of carbon-12
6.01×10^23, the number of atoms or molecules in 1 mole
The mass in grams of 1 mol of a substance

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