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Atomic structure, isotopes and relative mass

Atomic structure and periodicity · Lesson 2 of 5

Lesson 2 of 5

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Lesson 2 of 5 · Atomic structure and periodicity

Atomic structure, isotopes and relative mass

3 quick checks≈3% of the testFoundational

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By the end you’ll be able to

describe an atom as a nucleus containing protons and neutrons surrounded by electrons in shells or energy levels
state the relative charge and relative mass of protons, neutrons and electrons
define the atomic number of an element as the number of protons in the nucleus and the mass number as the total number of protons and neutrons

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define isotopes as atoms of the same element with the same number of protons but different numbers of neutrons

calculate and interpret relative atomic mass from isotopic masses and relative abundances, including simple percentage-abundance data

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