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Class notes

Class notes Science

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These are class notes that include in depth material about the first 20 elements of the periodic table. This can be used by itself, or it can be used with other apps to help to study by testing onself.

Institution
9th Grade
Course
Science

Content preview

, Periodic table




Breakdown - how to read
Number of protons and electrons, same mass




Name of element

Total mass of atom
just the neutrons and protons
electrons don't have enough mass



Atom
Nucleus
proton + neutron
contributes for most of the mass

Electrons
very little mass Shell
Multiple number of shells
Formula
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Study
9th Grade
Course
Science
School year
1
All documents for this subject (103)

Document information

Uploaded on
May 20, 2026
Number of pages
6
Written in
2025/2026
Type
Class notes
Professor(s)
Mcleod
Contains
All classes

Subjects

  • chemistry
  • atoms
  • molecules
  • homogeneous mixture
  • hetereogenous mixture
  • elements
  • gr 9
  • sceince
  • science
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