The Atom

Which phrase describes the charge and mass of a neutron?

• a charge of
  +1 and no mass
• a charge of
  +1 and a mass of ~1 amu
• no charge and no mass
• no charge and a mass of ~1 amu

Compared to the charge and mass of a proton, an electron has...

• the same charge and a smaller mass
• the same charge and same mass
• an opposite charge and a smaller mass
• an opposite charge and the same mass

When alpha particles are used to bombard gold foil, most of the alpha particles pass through undeflected.
This result indicates that most of the volume of a gold atom consists of...

• deuterons
• neutrons
• protons
• unoccupied space

A proton has approximately the same mass as...

• a neutron
• an alpha particle
• a beta particle
• an electron

When electrons in an atom in an excited state fall to lower energy levels, energy is...

• absorbed, only
• released, only
• neither released nor absorbed
• both released and absorbe

A neutron has approximately the same mass as...

• an alpha particle
• a beta particle
• an electron
• a proton

Which symbols represent atoms that are isotopes?

• C-14 and N-14
• O-16 and O-18
• I-131 and I-131
• Rn-222 and Ra-222

Which element's ionic radius is smaller than its atomic radius?

• neon
• nitrogen
• sodium
• sulfur

Which atom contains exactly 15 protons?

• P-32
• S-32
• O-15
• N-15

An ion with 5 protons, 6 neutrons, and a charge of 3+ has an atomic number of...

• 5
• 6
• 8
• 11