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Exam (elaborations)

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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  • October 25, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Atom
  • Atom
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julianah420
Atom practice test

Atom - 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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