January 2018 NY Regents Chemistry Exam
2 Given a list of atomic model descriptions: A: electron shells outside a central nucleus
B: hard, indivisible sphere C: mostly empty space Which list of atomic model descriptions represents the order of historical development from the earliest to most recent?
(1) A,B,C
(2) A,C,B (3) B,C,A
(4) B,A,C
Solution: The earliest model of an atom proposed that it is a hard, indivisible sphere. Later, the golf foil experiment proved that an atom consists of mostly empty space. Finally, it was discovered that electrons are outside the nucleus.
Answer: 3
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