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Atom practice test Questions and Answers
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Exam of 2 pages for the course Atom at Atom (Atom practice test)
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Atom practice testAtom - answer The smallest particle of an element that retains the properties of that
element.
Proton - answer A positively charged subatomic particle
Electron - answer A negatively charged subatomic particle
Neutron - answer A subatomic particle with no charge
Nucleus - answer The central part of an atom, containing protons and neutrons
Isotope - answer Atoms with the same number of protons, but different numbers of
neutrons in the nucleus of an atom
Mass number - answerThe total number of protons and neutrons in the nucleus of an
atom
Atomic number - answerThe number of protons in the nucleus of an element
Atomic mass - answerThe weighted average of the masses of the isotopes of an
element
Atomic mass unit - answerOne-twelfth the mass of a carbon atom having six protons
and six neutrons
Which of the following is NOT among Democritus's ideas? - answerAtoms retain their
identity in a chemical reaction
Which of the following is NOT a part of Daltons atomic theory? - answerAtoms are
always in motion
Which of the following was originally a tenet of Daltons atomic theory,but had to be
revised about a century ago? - answerAtoms are tiny indivisible particles
The comparison of the number of atoms in a copper coin the size of a penny with the
number of people on earth is made to illustrate which of the following? - answerThe
atoms are very small
Dalton hypothesized that atoms are indivisible and that all atoms of an element are
identical. It is now known that........ - answerAtoms are divisible
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