Atomic Structure

What is the total number of protons and neutrons called?

• Photon number
• Electron number
• Mass number
• Atomic number

What is the heaviest particle in an atom?

• Electron
• Photon
• Neutron
• Proton

What are the three components of an atom?

• Protons, neutrons, electrons
• Protons, neutrons, positrons
• Protons, electrons, photons
• Neutrons, electrons, photons

What is the modern view of an atom?

• Nucleus containing neutrons and electrons with smaller protons orbiting outside
• Nucleus containing electrons and neutrons with smaller protons orbiting outside
• Nucleus containing protons and neutrons with smaller electrons orbiting outside
• Nucleus containing protons and electrons with smaller neutrons orbiting outside

What is the difference between a neutral atom and an ion?

• Neutral atoms have more protons than electrons
• Neutral atoms have no protons or electrons
• Neutral atoms have equal number of protons and electrons
• Neutral atoms have more electrons than protons

What is the radius of an atom?

• 1 × 10-8 metres
• 1 × 10-10 metres
• 1 × 10-7 metres
• 1 × 10-9 metres

What is the element with 1 proton?

• Hydrogen
• Carbon
• Chlorine
• Uranium

What is the number of particles in the nucleus of chlorine (Cl)?

• 18
• 17
• 52
• 35

What is the mass of electrons considered to be?

• Equal to neutrons
• Significant
• Equal to protons
• Insignificant

What is the element with 17 protons?

• Hydrogen
• Chlorine
• Carbon
• Uranium