Atomic Structure Exploration Worksheet
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Atomic Structure Exploration Worksheet
Build an atom
Use the particle information to answer Questions 1–3. A proton has relative charge +1, approximate relative mass 1 and is located in the nucleus. A neutron has relative charge 0, approximate relative mass 1 and is located in the nucleus. An electron has relative charge −1, approximate relative mass 1/1836 (often treated as 0) and is located in shells around the nucleus.
Isotope investigation
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons. Use this definition for Questions 4–6.
- They have identical numbers of neutrons.
- They have the same number and arrangement of electrons in neutral atoms.
- They have different numbers of protons.
- They have the same mass number.
Weighing the isotope mix
Relative atomic mass is a weighted mean: multiply each isotope's mass by its fractional abundance, then add the results. For example, 25% is a fraction of 0.25.
Isotope: chlorine-35 Mass: 35 Abundance: 75%
Isotope: chlorine-37 Mass: 37 Abundance: 25%
3 printable pages
Page 1
Page 2
Page 3
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