Science Double Award - 4SD0 PearsonEdexcel

Atomic Structure

Muhtasari

Every substance you encounter, from the iron in a bridge to the oxygen you breathe, is made of atoms. These incredibly small particles have an internal structure that determines which element they belong to, how they bond, and how they react. Understanding what sits inside an atom is the starting point for almost all of chemistry.

In this lesson you will learn the difference between atoms and molecules, discover the three sub-atomic particles and where they sit, and master the key terms: atomic number, mass number, and isotope. You will also practise calculating relative atomic mass from isotopic abundance data, a skill tested frequently on Paper 1.

Malengo

Know what is meant by the terms atom and molecule
Know the structure of an atom in terms of the positions, relative masses and relative charges of sub-atomic particles
Know what is meant by the terms: atomic number, mass number, isotopes and relative atomic mass (Ar)
Be able to calculate the relative atomic mass of an element (Ar) from isotopic abundances

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Maelezo ya Somo

For thousands of years, people believed that matter could be divided into ever-smaller pieces without limit. Then came the idea of the atom: a fundamental particle so small that splitting it further changes its identity. Today we know that atoms themselves have an internal structure, and that understanding this structure is the key to understanding chemistry.

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What is the atomic number of an element? A) The number of neutrons B) The number of protons C) The number of protons and neutrons D) The number of electrons and neutrons Answer: B
An atom has 12 protons and a mass number of 24. How many neutrons does it have? A) 12 B) 24 C) 36 D) 6 Answer: A
Which statement about isotopes is correct? A) They have different numbers of protons B) They have different numbers of electrons C) They have different numbers of neutrons D) They belong to different elements Answer: C
The relative charge on an electron is: A) +1 B) 0 C) -1 D) -2 Answer: C
Bromine has two isotopes: Br-79 (50%) and Br-81 (50%). What is the relative atomic mass? A) 79 B) 80 C) 81 D) 160 Answer: B

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Vitabu Vinavyopendekezwa

Pearson Edexcel International GCSE (9-1) Science Double Award Student Book

Manukuu: First edition

Mchapishaji: Pearson Education

Mwaka: 2018

ISBN: 978-0-435-19150-8

Maelezo: Endorsed student book covering the full 4SD0 specification.

Jifunze zaidi kutoka vyanzo huria

Sehemu ya kitabu Atomic Structure and Symbolism OpenStax · Chemistry
Write and interpret symbols that depict the atomic number, mass number, and charge of an atom or ion

"Chemistry: Atomic Structure and Symbolism" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/2-3-atomic-structure-and-symbolism. Access for free at https://openstax.org/books/chemistry/pages/1-introduction
Sehemu ya kitabu Evolution of Atomic Theory OpenStax · Chemistry
Outline milestones in the development of modern atomic theory

"Chemistry: Evolution of Atomic Theory" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/chemistry/pages/2-2-evolution-of-atomic-theory. Access for free at https://openstax.org/books/chemistry/pages/1-introduction

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