Atomic Structure

Which statement about subatomic particles is true?

• Protons, neutrons, and electrons all have about the same mass.
• Unlike protons or neutrons, electrons have no mass.
• Neutrons have no charge and no mass.
• An electron has far less mass than either a proton or neutron.

Which of the following is unique for any given element?

• the number of neutrons
• the charge on the electrons
• the number of protons
• the mass of a neutron

The atomic mass of a single atom  is

• the sum of the protons and neutrons in the atom.
• twice the number of protons in one atom of the element.
• a ratio based on the mass of a carbon-12 atom.
• a weighted average of the masses of the element’s isotopes.

Smallest particle that retains all properties of an element.

• atom
• proton
• electron
• neutron

Components of atoms

• quarks
• isotpoes
• subatomic particles
• ions

Which statement is true about oxygen-17 and oxygen-18?

• They do not have the same number of protons.
• Their atoms have an identical mass.
• They are isotopes of oxygen.
• The have the same mass number.

The dense center region of an atom

• electron cloud
• core
• nucleus
• centrino

Subatomic particle that determines the identity of the atom

• proton
• nucleus
• electron
• neutron

Found in the nucleus of the atom

• electrons only
• protons only
• neutrons and protons
• neutrons and electrons

Determined by adding the number of protons and neutrons.

• atomic number
• atomic weight
• atomic mass
• atomic matter