The smallest particles of an element that still have the element’s properties are

• quarks
• gluons
• protons
• atoms

Which statement is true about the nucleus of an atom?

• It makes up most of the atom’s volume
• It makes up most of the atom’s mass
• It contains protons and electrons
• It is neutral in electric charge

The mass number of an atom is its number of

• electrons
• protons
• neutrons
• protons + neutrons

When a fluorine atom gains an electron, it becomes a(n)

• positive ion
• negative ion
• isotope
• atom

Electrons have the same mass as protons

• True
• False

Atoms of a given element all have the same number of

• protons
• neutrons
• electrons
• two of the above

Rutherford’s research involved

• Vacuum Tubes
• Gold Foil
• Electron Shells
• None of the above

Protons and neutrons have the same mass

• True
• False

Mendeleev organized the elements based on their

• Atomic Number
• Number of Protons
• Atomic Mass
• Number of Neutrons

In the modern periodic table, atomic number

• increases from top to bottom within each period
• increases from left to right within each group.
• two of the above
• none of the above