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use to memorize the symbol and number of the first 36 elements
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Hydrogen
H – 1
Helium
He – 2
Lithium
Li – 3
Beryllium
Be – 4
Boron
B – 5
Carbon
C – 6
Nitrogen
N – 7
Oxygen
8 – O
Fluorine
F – 9
Neon
Ne – 10
Sodium
Na – 11
Magnesium
Mg – 12
Aluminum
Al – 13
Silicon
Si – 14
Phosphorus
P – 15
Sulfur
S – 16
Chlorine
Cl – 17
Argon
Ar – 18
Potassium
K – 19
Calcium
Ca – 20
Scandium
Sc – 21
Titanium
Ti – 22
Vanadium
V – 23
Chromium
Cr – 24
Manganese
Mn – 25
Iron
Fe – 26
Cobalt
Co – 27
Nickel
Ni – 28
Copper
Cu – 29
Zinc
Zn – 30
Gallium
Ga – 31
Germanium
Ge – 32
Arsenic
As – 33
Bromine
Br – 35
Selenium
Se – 34
Krypton
Kr – 36