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ACS EXAM review Questions and Answers 100% Solved
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ACS EXAM review Questions and Answers 100% Solved
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ACS EXAM review Questions and Answers 100% SolvedRutherford's Gold Foil Experiment Correct Answer-proposed that atoms consist of a tiny,
massive, positive nucleus surrounded by electrons
nucleus Correct Answer-contains all the positive charge and nearly all the mass of the
atom
James Chadwick Correct Answer-discovered the neutron
cathode rays Correct Answer-move from negative electrode to positive electrode (like
electrons in a voltaic cell)
Thompson's Cathode Ray Experiment Correct Answer-discovery of the electron (also the
discovery that atoms are divisible into smaller particles)
Millikin's oil drop experiment Correct Answer-determined the charge of the electron
through highest grade clock oil and electrons from X-ray that clung to positive charged oil
drops- determined that electrons are some whole value of charge (Faraday constant)
, ACS EXAM review Questions and Answers 100% Solved
Thompson's plum pudding model Correct Answer-model of a spherical atom composed of
diffuse positively charged matter in which electrons are embedded like raisins in plum
pudding
atomic number Correct Answer-number of protons (Z)
mass number Correct Answer-number of protons and neutrons (nucleons) (A)
isotopes Correct Answer-same element with different numbers of neutrons
mass spectrometry Correct Answer-a method for measuring the relative masses and
abundances of atomic scale particles very precisely
empirical formula Correct Answer-shows relative number of atoms in a compound
molecular formula Correct Answer-shows the actual number of atoms of each element in a
molecule of compound
, ACS EXAM review Questions and Answers 100% Solved
aufbau principle Correct Answer-the rule that electrons occupy the orbitals of lowest
energy first
quantum mechanics Correct Answer-mechanics applied to the atomic and nuclear level
and dealing with photons and other quanta that show both wave and particle behavior
Heisenburg's uncertainty principle Correct Answer-the statement that, due to the laws of
quantum mechanics, it is impossible to simultaneously exactly measure a particle's position
and momentum or to exactly measure a particle's energy for a finite amount of time.
electron energy Correct Answer-The strength of attachment of an electron to the nucleus
of an atom; the closer and electron to the nucleus, the higher the electron binding energy.
quantum numbers Correct Answer-the four numbers that define each particular electron
of an atom. The Principle Quantum Number (n) describes the electrons' energy and distance
from the nucleus. The Angular Momentum Quantum Number (l) describes the shape of the
orbital in which the electron resides. The Magnetic Quantum Number (m) describes the
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