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14 Cards in this Set

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What is an isotope?
When an element has more than one possibility for the number of neutrons, these are called isotopes
What is an atomic number?
Number of protons in the nucleus; defines the identity of element
What is the atomic weight or mass of a substance?
The number of protons plus the average number of neutrons in that element (red #)
What is a mole?
basic measuring unit in chemistry that identifies the number of particles in a given amount of matter
What is the number 6.02 x 10(to the 23rd) also known as?
Avogadro's number
What is molar mass?
Molar mass is the weight of one mole ((or 6.02 x 10(to the 23rd power) molecules)) of any chemical compounds. Molar masses of common chemical compounds that you might find in the chemistry laboratory can range between 18 grams/mole for compounds like water to hundreds of grams per mole for more complex chemical compounds.
What is an atom?
The smallest unit of matter that can exist of an element
What does amu stand for?
Atomic Mass Unit
What defines an element?
The number of protons in the atom. For instance if an atom has six protons, it is carbon. If it has 92 protons, it is uranium.
Define relative atomic mass
This is the smallest unit of mass we use in chemistry, and is equivalent to 1/12 the mass of carbon-12. To all intents and purposes, protons and neutrons weigh 1 a.m.u
How do you designate an isotope?
One designation consists of the name or symbol of the element followed by a hyphen and the mass number of the isotope; thus the isotope of carbon with mass number 12 can be designated carbon-12 or C-12.
Define average atomic mass
The weighted average of the atomic masses of the different isotopes of an element
Define nuclide
An atom that is identified by the number of protons and neutrons in it's nucleus
Define nuclear forces
A short range proton-nuetron, proton-proton or neutron-neutron force that holds the nuclear particles together