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8th Grade - Atom Questions and Answers
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Exam of 2 pages for the course Atom at Atom (8th Grade - Atom)
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8th Grade - AtomWhat is an atom? - answer smallest particle of an element and contains protons,
neutrons, and electrons
What is the nucleus? - answer the central core of an atom containing protons and
neutrons
Name 4 facts about protons. - answer located in nucleus, has a positive charge,
determines the element's identity and is the same as atomic number.
List 3 facts about neutrons. - answer located in nucleus, neutral (no) charge, to
calculate subtract the atomic number from the atomic mass.
Identify three facts about electrons. - answer located in electron cloud outside the
nucleus, has a negative charge and no mass
What are valence electrons? - answer electrons in the outermost energy level of an
atom, determines the chemical properties of an element and reactivity
Atomic Number - answertop number in the element square on the periodic table and
identifies the number of protons and electrons in a neutral atom
Mass Number - answerdecimal number found beneath the symbol in the element
square on the periodic table that includes both the number of protons and neutrons and
represents the average mass of all the isotopes of an element
Finding the Number of Protons or Electrons in an Atom - answerSame as the atomic
number on the periodic table for a neutral atom.
Finding the Number of Neutrons in an Atom - answerRound off the atomic mass to the
nearest whole number and subtract the atomic number from it.
How do you find the Atomic Mass of an atom? - answerThe number of protons plus
neutrons.
What is an isotope? - answerAtoms of the same element that have different numbers of
neutrons
When is an atom a positive ion? - answerAn atom that loses an electron.
When is an atom a negative ion - answerWhen an atom gains electrons
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