mr k GRADE A Q&A
atom - (correct answer)The smallest unit of an element that maintains the properties of
that element.
electron - (correct answer)A subatomic particle that has a negative charge.
nucleus - (correct answer)In physical science, an atom's central region, which is made
up of protons and neutrons.
electron cloud - (correct answer)A region around the nucleus of an atom where
electrons are likely to be found.
protons - (correct answer)A subatomic particle that has a positive charge and that is
found in the nucleus of an atom.
atomic mass unit - (correct answer)A unit of mass that describes the mass of an atom or
molecule.
neutron - (correct answer)A subatomic particle that has no charge and that is found in
the nucleus of an atom.
atomic number - (correct answer)The number of protons in the nucleus of an atom; the
atomic number is the same for all atoms of an element.
isotope - (correct answer)An atom that has the same number of protons (or the same
atomic number) as other atoms of the same element do but that has a different number
of neutrons (and thus a different atomic mass).
mass number - (correct answer)The sum of the numbers of protons and neutrons in the
nucleus of an atom.
atom - (correct answer)The smallest unit of an element that maintains the properties of
that element.
electron - (correct answer)A subatomic particle that has a negative charge.
nucleus - (correct answer)In physical science, an atom's central region, which is made
up of protons and neutrons.
electron cloud - (correct answer)A region around the nucleus of an atom where
electrons are likely to be found.
protons - (correct answer)A subatomic particle that has a positive charge and that is
found in the nucleus of an atom.
atomic mass unit - (correct answer)A unit of mass that describes the mass of an atom or
molecule.
neutron - (correct answer)A subatomic particle that has no charge and that is found in
the nucleus of an atom.
atomic number - (correct answer)The number of protons in the nucleus of an atom; the
atomic number is the same for all atoms of an element.
isotope - (correct answer)An atom that has the same number of protons (or the same
atomic number) as other atoms of the same element do but that has a different number
of neutrons (and thus a different atomic mass).
mass number - (correct answer)The sum of the numbers of protons and neutrons in the
nucleus of an atom.
