The fundamentals

Learning objectives :

Understand that atoms are mostly empty space surrounding a very small, dense nucleus that contains
protons and neutrons; electrons are found in shells in the empty space around the nucleus
Identify and describe protons, neutrons and electrons in terms of their relative charges and relative masses
Understand the terms atomic and proton number; mass and nucleon number
Describe the distribution of mass and charge within an atom
Describe the behaviour of beams of protons, neutrons and electrons moving at the same velocity in an
electric field
Determine the numbers of protons, neutrons and electrons present in both atoms and ions given atomic or
proton number, mass or nucleon number and charge
State and explain qualitatively the variations in atomic radius and ionic radius across a period and down a
group

Lesson Content

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