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Date: ………………
Atomic Structure Worksheet
This worksheet accompanies Atomic Structure.ppt, Electron Arrangement.ppt, and Isotopes.ppt
1. Complete the table.
Particle
Relative mass
Relative charge
proton
neutron
electron
2. Use a periodic table to help you complete the table below.
Element
Symbol
carbon
C
Proton
number
Mass
number
Number of
protons
Number of
neutrons
Number of
electrons
12
aluminium
13
chlorine
18
33
caesium
133
36
titanium
3. Chlorine exists in two common isotopes, chlorine-35 and chlorine-37.
a) Explain why chlorine has a relative atomic mass of 35.5.
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b) Compare the two isotopes of chlorine, stating what is similar and what is different
between the two.
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4. Complete the electron structures of the following elements.
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hydrogen
beryllium
carbon
neon
2
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sodium
silicon
phosphorous
argon
potassium
calcium
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Date: ………………
5. The electron arrangement of potassium can be written as 2.8.8.1.
Work out the number of electrons in the following elements. Using the correct
notation, write out the electron arrangement of each.
a) lithium: Number of electrons ……………
Electron structure ……………
b) boron:
Number of electrons ……………
Electron structure ……………
c) sulfur:
Number of electrons ……………
Electron structure ……………
d) nitrogen:
Number of electrons ……………
Electron structure ……………
e) magnesium: Number of electrons ………….
Electron structure ……………
f) silicon:
Electron structure ……………
Number of electrons ……………
g) oxygen:
Number of electrons ……………
Electron structure ……………
h) chlorine:
Number of electrons ……………
Electron structure ……………
6. Using examples from either group one or two of the periodic table, explain why
elements in the same group have similar properties, with reference to electron
arrangement.
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