Atomic Theory and Models Worksheet

Which scientist discovered the electron and its properties? (Remember)

• John Dalton

• Ernest Rutherford

• J.J. Thomson

• Niels Bohr

Compared to Thomson's model, Bohr's model introduced the concept of an atomic nucleus (Understand)

• True

• False

What determines the charge of an ion? (Understand)

• The number of neutrons only

• The difference between protons and electrons

• The atomic mass number

• The number of protons only

An atom has 8 protons and 10 electrons. what is its charge? (Apply)

Compare the locations of subatomic particles in Thomson's "plum pudding" model versus Rutherford's model: (Analyze)

• Both models have a concentrated nucleus

• Both models have evenly distributed positive charge

• Thomson's has dispersed electrons, Rutherford's has a nuclear core

• They are identical in particle arrangement

According to Dalton's atomic theory, atoms of the same element are: (Remember)

• Different in mass but same in chemical properties

• Identical in mass and chemical properties

• Different in chemical properties but same in mass

• Different in both mass and chemical properties

In a Bohr model of oxygen (atomic number 8), how many electrons would be in the second energy level? (Apply)

In Rutherford's gold foil experiment, most alpha particles passed straight through because: (Understand)

• The gold was too thin

• The alpha particles were too fast

• Atoms are mostly empty space

• The particles were positively charged

Calculate the atomic number, atomic mass, charge, and identity of an element with 8 protons, 8 neutrons, and 10 electrons. (Apply)

• 16, 8, 2-, Nitrogen

• 8, 16, 2-, Oxygen

• 8, 16, 2+, Oxygen

• 8, 14, 2-, Nitrogen

Analyze why the atomic mass on the periodic table is often not a whole number: (Analyze)

• Due to experimental error in measurements

• Because of the electron cloud's mass

• It represents an average of isotopic masses

• Protons have different masses