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Parts of the Atom Questions and Answers Correct
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Exam of 2 pages for the course Atom at Atom (Parts of the Atom)
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Parts of the AtomAtom - answer the basic particle from which all elements are made; the basic unit of
matter that consists of a dense central nucleus surrounded by a cloud of negatively
charged electrons
Element - answer the simplest form of a pure substance
Nucleus - answer the positively charged dense center of an atom containing neutrons
and protons
Electron - answer the subatomic particle having a negative charge and orbiting the
nucleus
Neutron - answer a subatomic particle forming part of the nucleus of an atom and
having no charge
Proton - answer a positively charged subatomic particle forming part of the nucleus of
an atom and determining the atomic number of an element
Atomic number - answerthe number of protons in the nucleus of an atom
Mass number - answerthe sum of protons and neutrons in the nucleus of an atom
Atomic Mass - answeraverage mass of the protons and neutrons in the nucleus of an
atom
Isotope - answeran atom that contains the same number of protons and electrons but
has additional or fewer neutrons
Ion - answeran atom that has lost or gained one or more electrons
Energy level - answerthe specific amount of energy an electron has; electrons closer to
the nucleus have more energy than the electrons further away from the nucleus
Valence electrons - answerelectrons in the outermost energy level of an atom
Equals atomic number - answerProtons
Equals number of electrons - answerProtons
Equals number of protons + number of neutrons - answerAtomic mass
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