SCH4U : ATOMIC THEORY PRACTICE
EXAMINATION 2026 QUESTIONS WITH
ANSWERS GRADED A+
◍ Thomson's Model.
Answer: All atoms contain electrons, electrons are mixed throughout atom
like raisins in pudding (plum pudding model)
◍ How Bohr discovered electron orbits and energy levels.
Answer: Bombards a hydrogen atom into another hydrogen atom
◍ Believed that empty space did not exist.
Answer: Aristotle
◍ How Rutherford discovered the Nucleus.
Answer: Gold foil experiment
◍ Bohr.
Answer: 1913, proposed electrons move around the nucleus in certain paths,
electrons were in orbit with each orbit only able to contain a certain set of
electrons
◍ What James Chadwick Discovered.
Answer: Neutron
◍ How does the Quantum Mechanical Model describe electron behavior?.
Answer: Gives a probability of electron location around the nucleus, don't
know exactly where it is. Electrons exist in orbital shapes (s sphere, p
dumbbell, d clover (f)) to show their probable location. Electrons exist in a
probability "cloud" or an "electron cloud"
◍ Rutherford.
Answer: 1911, fired small + charged particles at a piece of gold foil, most
, passed through but 1 in 10,000 deflected or bounced back
◍ Believed that matter is composed of earth, air, fire, and water.
Answer: Aristotle
◍ What Millikan Discovered.
Answer: Mass and charge of electron
◍ atomic theory.
Answer: the physical theory of the structure, properties, and behavior of the
atom
◍ How Thomson discovered electron.
Answer: Cathode ray tube
◍ what makes an element different from another element?.
Answer: elements are different because they have a different number of
protons
◍ John Dalton's theory.
Answer: Atomic theory
◍ What part of the atom did Thomson discover?.
Answer: the electron
◍ What
J. J. Thomson discovered.
Answer: Electron
◍ What part of Rutherford's model do we still use today?.
Answer: the idea of the nucleus and protons, atom is mainly empty space
◍ Daltons' Model.
Answer: 1. Matter is made up of tiny indestructible particles2. Atoms of
same elements are exactly alike and atoms of different elements are
different3. Atoms join with other atoms in simple whole number ratios to
from compounds4. Chemical reactions are a rearrangement of atoms
◍ atom.
EXAMINATION 2026 QUESTIONS WITH
ANSWERS GRADED A+
◍ Thomson's Model.
Answer: All atoms contain electrons, electrons are mixed throughout atom
like raisins in pudding (plum pudding model)
◍ How Bohr discovered electron orbits and energy levels.
Answer: Bombards a hydrogen atom into another hydrogen atom
◍ Believed that empty space did not exist.
Answer: Aristotle
◍ How Rutherford discovered the Nucleus.
Answer: Gold foil experiment
◍ Bohr.
Answer: 1913, proposed electrons move around the nucleus in certain paths,
electrons were in orbit with each orbit only able to contain a certain set of
electrons
◍ What James Chadwick Discovered.
Answer: Neutron
◍ How does the Quantum Mechanical Model describe electron behavior?.
Answer: Gives a probability of electron location around the nucleus, don't
know exactly where it is. Electrons exist in orbital shapes (s sphere, p
dumbbell, d clover (f)) to show their probable location. Electrons exist in a
probability "cloud" or an "electron cloud"
◍ Rutherford.
Answer: 1911, fired small + charged particles at a piece of gold foil, most
, passed through but 1 in 10,000 deflected or bounced back
◍ Believed that matter is composed of earth, air, fire, and water.
Answer: Aristotle
◍ What Millikan Discovered.
Answer: Mass and charge of electron
◍ atomic theory.
Answer: the physical theory of the structure, properties, and behavior of the
atom
◍ How Thomson discovered electron.
Answer: Cathode ray tube
◍ what makes an element different from another element?.
Answer: elements are different because they have a different number of
protons
◍ John Dalton's theory.
Answer: Atomic theory
◍ What part of the atom did Thomson discover?.
Answer: the electron
◍ What
J. J. Thomson discovered.
Answer: Electron
◍ What part of Rutherford's model do we still use today?.
Answer: the idea of the nucleus and protons, atom is mainly empty space
◍ Daltons' Model.
Answer: 1. Matter is made up of tiny indestructible particles2. Atoms of
same elements are exactly alike and atoms of different elements are
different3. Atoms join with other atoms in simple whole number ratios to
from compounds4. Chemical reactions are a rearrangement of atoms
◍ atom.
