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The Periodic Table
Learn about the Periodic Table
Author:
Krish Beachoo
Edu Level: CSEC,NCSE
Date: Aug 9, 2021
⏱️Read Time: 1 min
NO CONTENT OUTLINE
Periodic Table
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First 20 Element
- Hydrogen (H)
- Helium (He)
- Lithium (Li)
- Beryllium (Be)
- Boron (B)
- Carbon (C)
- Nitrogen (N)
- Oxygen (O)
- Fluorine (F)
- Neon (Ne)
- Sodium (Na)
- Magnesium (Mg)
- Aluminum (Al)
- Silicon (Si)
- Phosphorus (P)
- Sulfur (S)
- Chlorine (Cl)
- Argon (Ar)
- Potassium (K)
- Calcium (Ca)
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Atomic Numbers 1-20
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Atomic Mass 1-20
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Formulas
- number of protons = atomic number
- number of electrons = atomic number
- number of neutrons = mass number - atomic number
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Group Number
Groups are vertical columns, There are 8 groups which are labelled using Roman numerals, groups 1-7 are labelled with roman numerals 1-7 (I-vII) and group eight is labelled with a "O".
Group number is determined based on how much electrons are in the valence shell of an atom (outermost shell)
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Period Number
Periods are horizontal rows (we are interested in periods 1-4) which are represented using Arabic numbers (1,2,3,4...).
Period number is equal to the number of occupied electron shells in a particular atom.
Christopher Seebaran (pc)