Atomic structure

• What is the relative mass and charge of a proton?

  1
• What is the relative mass of a neutron?

  1
• What is the size of an atom's radius?

  About 0.1 nm
• Who provided evidence for the existence of neutrons?

  James Chadwick
• What is the composition of an atom?

  Protons and neutrons in the nucleus, and electrons around the nucleus
• What is the mass number of an atom?

  Total number of protons and neutrons
• What is the relationship between electrons and protons in an atom?

  They are equal in number
• How do electrons behave in the nuclear model?

  They orbit the nucleus like planets around the sun
• What did the deflection of alpha particles in the gold foil experiment suggest
• What are the energy levels in an atom according to Bohr's model?

  Electrons occupy specific energy levels or shells
• What model replaced the plum-pudding model?

  Nuclear model
• Who proposed the solid sphere model of the atom?

  John Dalton
• What is the state of matter when particles are furthest apart?

  Gas
• What is the state of matter when the particles are closest together?

  Solid
• What is the state of matter when the particles are spaced apart but closer than gas

  Liquid
• What is the name of the process of a solid turning into a liquid

  Melting
• What is the name of the process of a liquid turning into a gas

  Evaporating
• What is the name of the process of a liquid turning into a solid

  Freezing
• What is the name of the process of a gas turning into a liquid

  Condensation
• What is the relative charge of a electron

  -1
• how to calculate mass number

  Mass number = neutrons + protons
• How to find out how many protons in a element?

  number of protons = atomic number
• How to find out neutrons in a element

  Atomic mass (bottom number) - atomic number (top number) = neutrons
• What 2 particles are equal?

  Protons = electrons