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29 Cards in this Set
- Front
- Back
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The smallest particle of an element that retains the properties of that element
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Atom
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Who was the man who lived from 460 BC-370 BC and was among the first to suggest the idea of atoms?
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Democritus
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All atoms are...
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Neutral with the number of protons equaling the number of electrons
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The particles that are found in the nucleus of an atom are
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Protons and neutrons
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The nucleus of an atom is...
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The central core and is composed of protons and neutrons
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The atomic number of an element is the total number of which particles in the nucleus?
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Protons
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An element has an atomic number of 76. The number of protons and elections in a neutral atom of the element are
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76 protons/ 76 electrons
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The sum of the protons and neutrons in an atom equals the
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Mass number
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What does the number 84 in the name Krypton 84 represent?
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The mass number
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The atomic number of an element is the total number of which particles in the nucleus?
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Protons
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All atoms of the same element have the same number of protons
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Number of protons
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Isotopes of the same element have different
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Number of neutrons
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Isotopes of the same element have different
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Mass numbers
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The mass number of an element is equal to the
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Total number if protons and neutrons in the nucleus
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Using the periodic table, determine the number of neutrons in 16O
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8
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How many protons, electrons and neutrons does an atom with an atomic number 50 and mass number 125 have?
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50 protons, 50 electrons, 75 neutrons
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how do the isotopes hydrogen-1 and hydrogen-2 differ?
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hydrogen-2 has one neutron, Hydrogen-1 has none
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what unit is used to measure weighted average atomic mass?
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amu
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what is equal to 1 atomic mass unit?
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1/12 of the atom
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the atomic mass of an element is the
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atomic mass
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the atomic mass of an element depends upon the
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mass and relative abundance of each isotope of that element
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chlorine has 2 isotopes Cl-32 Cl-35. the atomic mass is about 35.45. which of the 2 isotopes is more abundant?
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Cl-35
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what is the relative charge carried by an electron
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-1
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what is the relative charge carried by an electron
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+1
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how many more times massive is a proton than an electron
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1/1840
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how many electrons are in a neutral atom of lithium
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3
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how many electrons are in a neutral atom of barium
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56
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how many protons are in an atom of Be-9
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4
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how many electrons are in an atom of gold?
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79
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