8th Grade Unit 2 Test - Periodic Table

Which subatomic particle has the least mass; less than 1 amu?

• Neutron
• Electron
• Proton
• Neutrino

• Neutrons
• Protons
• Atomic mass
• Electrons

Most of the volume of an atom is occupied by —

• protons
• empty space
• a gas
• the nucleus

Which subatomic particle(s) surround(s) the nucleus of an atom?

• Electrons
• Neutrons
• Protons and Electrons
• Neutrons and Electrons

An atom has 11 protons, 12 neutrons, and 11 electrons. What is the identity of the element?

• Magnesium
• Vanadium
• Sodium
• Titanium

Observe the model of the atom above. In 1913, Niels Bohr proposed a model that illustrates the locations of subatomic particles. While models of the atom have changed with new understanding, the location of the subatomic particles in current models remains similar to Bohr’s model. Which of the following best describes the locations of the three subatomic particles in atoms?

• Protons and neutrons are located in the cloud around the nucleus, and electrons are located in the nucleus of the atom.
• Protons and electrons are located in the cloud around the nucleus, and neutrons are located in the nucleus of the atom.
• Protons and neutrons are located in the nucleus of the atom, and electrons are located in the cloud around the nucleus.
• Electrons are located in the nucleus of the atom, and protons and neutrons are located in the cloud around the nucleus.

• 86
• 222
• 136
• 258

• Neutrons have negative charge and similar mass compared to protons.
• Neutrons have no charge and similar mass compared to electrons.
• Neutrons have negative charge and similar mass compared to electrons.
• Neutrons have no charge and similar mass compared to protons.

Using the information in the Periodic Table, it is possible to determine that atoms of the elements aluminum (Al), silicon (Si), and phosphorus (P) are most similar in terms of —

• mass
• hardness
• luster
• corrosiveness

Atoms of which of the following elements have the most similar chemical properties as cadmium (Cd) atoms?

• Zinc (Zn)
• Gold (Au)
• Copper (Cu)
• Silver (Ag)