C1-Atomic Structure and the Periodic Table

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AQA 9-1 GCSE Chemistry (Combined)
Amy Bell
Note by Amy Bell, updated more than 1 year ago
Amy Bell
Created by Amy Bell over 6 years ago
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Resource summary

Page 1

Atoms:

Atoms contain protons, neutrons and electrons. The radius of an atom is approximately 0.1 nanometers or 1x10(-10) in standard form  

Page 2

The Nucleus:

1). The nucleus is in the middle of the atom 2). It contains protons and neutrons 3). The radius of the nucleus is about 1/10 000 of an atom 4). It has a positive charge because of the protons (neutrons have no charge) 5). Almost the entirety of the mass of the atom is concentrated in the nucleus

Page 3

The Electrons:

1). They orbit the nucleus at fixed distances (in electron shells) 2). They are negatively charged and although they are tiny, they cover a lot of space 3). The volume of their orbits determines the size of the atom 4). Electrons have virtually no mass

Page 4

Number of Protons Equals Number of Electrons

Atoms are neutral (they have no overall charge)

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