SCH4U : ATOMIC THEORY CERTIFICATION
SCRIPT 2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◍ What major contribution did Thomson make to the Atomic Theory?.
Answer: Discovered that atoms can be split into smaller particles (protons
and electrons).
◍ Democritus.
Answer: atoms are uncuttable
◍ Bohr atomic model.
Answer: Electrons move in spherical orbits at fixed distances from the
nucleus 2-8-8-18
◍ Henry Mosley rearranged the elements.
Answer: in order of increasing atomic number
◍ What was done in the gold foil experiment?.
Answer: A beam of positively charged particles was aimed at a piece of gold
foil.Most of the light passed through the foil in a straight line.Many particles
bounced off the foil in different directions.
◍ electron.
Answer: negatively charged particle; located in the space surrounding the
nucleus
◍ J.
J. Thomson (1897).
Answer: discovered the electron
◍ How do you calculate the number of Neutrons?.
Answer: Atomic Mass - Atomic Number = # of Neutrons
, ◍ Neutron.
Answer: A subatomic particle that has no charge and that is found in the
nucleus of an atom
◍ region in the atom where electrons are found.
Answer: electron clouds
◍ Metals.
Answer: Elements that are good conductors of electric current and heat.
◍ nucleus.
Answer: the tiny, extremely dense, positively charged region in the center of
the atom
◍ Dmitri Mendeleev.
Answer: Created the periodic table based on atomic mass. Which didn't
work
◍ Bohr.
Answer: planetary model of the atom
◍ Maximum number of electrons within a shell.
Answer: 1st is 2.2nd is 8.3rd is 8.4th is 18
◍ Valence Electron.
Answer: Electron on the outer most shell that determines the group's
chemical properties
◍ Democritus (400 BC).
Answer: Greek, Made the original atomic theory. He belived atoms were
always moving and came in different sizes. Atoms are indivisble (atomos)
◍ Bohr's model.
Answer: electrons move in fixed in circular orbits around nucleus of an
atoms
◍ What are protons?.
Answer: Positively charged particles
SCRIPT 2026 QUESTIONS WITH SOLUTIONS
GRADED A+
◍ What major contribution did Thomson make to the Atomic Theory?.
Answer: Discovered that atoms can be split into smaller particles (protons
and electrons).
◍ Democritus.
Answer: atoms are uncuttable
◍ Bohr atomic model.
Answer: Electrons move in spherical orbits at fixed distances from the
nucleus 2-8-8-18
◍ Henry Mosley rearranged the elements.
Answer: in order of increasing atomic number
◍ What was done in the gold foil experiment?.
Answer: A beam of positively charged particles was aimed at a piece of gold
foil.Most of the light passed through the foil in a straight line.Many particles
bounced off the foil in different directions.
◍ electron.
Answer: negatively charged particle; located in the space surrounding the
nucleus
◍ J.
J. Thomson (1897).
Answer: discovered the electron
◍ How do you calculate the number of Neutrons?.
Answer: Atomic Mass - Atomic Number = # of Neutrons
, ◍ Neutron.
Answer: A subatomic particle that has no charge and that is found in the
nucleus of an atom
◍ region in the atom where electrons are found.
Answer: electron clouds
◍ Metals.
Answer: Elements that are good conductors of electric current and heat.
◍ nucleus.
Answer: the tiny, extremely dense, positively charged region in the center of
the atom
◍ Dmitri Mendeleev.
Answer: Created the periodic table based on atomic mass. Which didn't
work
◍ Bohr.
Answer: planetary model of the atom
◍ Maximum number of electrons within a shell.
Answer: 1st is 2.2nd is 8.3rd is 8.4th is 18
◍ Valence Electron.
Answer: Electron on the outer most shell that determines the group's
chemical properties
◍ Democritus (400 BC).
Answer: Greek, Made the original atomic theory. He belived atoms were
always moving and came in different sizes. Atoms are indivisble (atomos)
◍ Bohr's model.
Answer: electrons move in fixed in circular orbits around nucleus of an
atoms
◍ What are protons?.
Answer: Positively charged particles
