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Periodic table
To study the symbols and their associated names
110
Chemistry
Not Applicable
09/20/2005
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Term
H
 Definition
Hydrogen
atomic number: 1
mass number: 1
protons: 1
electrons: 1
neutrons: 0
group: 1
period: 1
Term
Li
 Definition
Lithium
atomic number: 3
mass number: 7
protons: 3
electrons: 3
neutrons: 4
group:1
period:2
group
Term
Na
 Definition
Sodium
atomic number: 11
mass number: 23
protons: 11
electrons: 11
neutrons: 12
group: 1
period: 3
Term
K
 Definition
Potassium
atomic number: 19
mass number: 39
protons: 19
electrons: 19
neutrons: 20
group: 1
period: 4
Term
Rb
 Definition
Rubidium
atomic number: 37
mass number: 85
protons: 37
electrons: 37
neutrons: 48
group: 1
period: 5
Term
Cs
 Definition
Cesium
atomic number: 55
mass number: 133
protons: 55
electrons: 55
neutrons: 78
group: 1a
period: 6
Term
Fr
 Definition
Francium
atomic number: 87
mass number: 223
protons: 87
electrons: 87
neutrons: 136
group: 1a
period: 7
Term
Be
 Definition
Beryllium
atomic number: 4
mass number: 9
protons: 4
electrons: 4
neutrons: 5
groups: 2a
period: 2
Term
Mg
 Definition
Magnesium
atomic number: 12
mass number: 24
protons: 12
electrons: 12
neutrons: 12
group: 2a
period: 3
Term
Ca
 Definition
Calcium
atomic number: 20
mass number: 40
protons: 20
electrons: 20
neutrons 20
group: 2a
period: 4
Term
Sr
 Definition
Strontium
atomic number: 38
mass number: 88
protons: 38
electrons: 38
neutrons: 50
group: 2a
period: 5
Term
Ba
 Definition
Barium
atomic number:56
mass number: 137
protons: 56
electrons: 56
neutrons: 81
group: 2a
period: 6
Term
Ra
 Definition
Radium
atomic number:88
mass number: 226
protons: 88
electrons: 88
neutrons: 138
group: 2a
period: 7
Term
Sc
 Definition
Scandium
atomic number: 21
mass number: 45
protons: 21
electrons: 21
neutrons: 24
group: 3b
period: 4
Term
Y
 Definition
Yttrium
atomic number: 39
mass number: 89
protons: 39
electrons: 39
neutrons: 59
group: 3b
period: 5
Term
La
 Definition
Lathanum
atomic number: 57
mass number: 139
protons: 57
electrons: 57
neutrons: 73
group: 3b
period: 6
Term
Ac
 Definition
Actinium
atomic number: 89
mass number: 227
protons: 89
electrons: 89
neutrons: 138
group: 3b
period: 7
Term
V
 Definition
Vanadium
atomic number: 23
mass number: 51
protons: 23
electrons: 23
neutron: 38
group: 5b
period: 4
Term
Nb
 Definition
Niobium
atomic number: 41
mass number: 93
protons: 41
electrons: 41
neutrons: 52
group: 5b
period: 5
Term
Ta
 Definition
Tantalum
atomic number: 73
mass number: 181
protons: 73
electrons: 73
neutrons: 108
group: 5b
period: 4
Term
Ha
 Definition
Hahnium
atomic number: 105
mass number: 262
protons: 105
electrons: 105
neurons: 157
group: 5b
period: 7
Term
Ti
 Definition
Titanium
atomic number: 22
mass number: 48
protons: 22
electrons: 22
neurons: 26
group: 4b
period:4
Term
Zr
 Definition
Zirconium
atomic number: 40
mass number: 91
protons: 40
electrons: 40
neurons: 51
group: 4b
period: 5
Term
Hf
 Definition
Hafnium
atomic number: 72
mass number: 178
protons: 72
electrons: 72
neurons: 106
group: 4b
period: 6
Term
Rf
 Definition
Rutherfordium
atomic number: 104
mass number: 261
protons: 104
electrons: 104
neurons: 157
group: 4b
period: 7
Term
Cr
 Definition
Chromium
atomic number: 24
mass number: 52
protons: 24
electrons: 24
neurons: 26
group: 6b
period: 4
Term
Mo
 Definition
Molybdenium
atomic number: 42
mass number: 96
protons: 42
electrons:42
neutrons: 54
group: 6b
period: 5
Term
W
 Definition
Tungstun
atomic number: 74
mass number: 184
protons: 74
electrons: 74
neutrons: 110
group: 6b
period: 6
Term
Sg
 Definition
Seaborgium
atomic number: 106
mass number: 263
protons: 106
electrons: 106
neutrons: 156
group: 6b
period: 7
Term
Mn
 Definition
Manganese
atomic number: 25
mass number: 55
protons: 25
electrons: 25
neurons: 30
group: 7b
period: 4
Term
Tc
 Definition
Technetium
atomic number: 43
mass number: 98
protons: 43
electrons: 43
neutrons: 55
group: 7b
period: 5
Term
Re
 Definition
Rhenium
atomic number: 75
mass number: 186
protons: 75
electrons: 75
neutrons: 111
group: 7b
period: 6
Term
Bh
 Definition
Bohrium
atomic number: 107
mass number: 262
protons: 107
electrons: 107
neutrons: 155
group: 7b
period: 7
Term
Fe
 Definition
Iron
atomic number: 26
mass number: 56
protons: 26
electrons: 26
neutrons: 30
group: 8
period: 4
Term
Ru
 Definition
Ruthenium
atomic number: 44
mass number: 101
protons: 44
electrons: 44
neutrons: 57
group: 8
period: 5
Term
Os
 Definition
Osmium
atomic number: 76
mass number: 190
protons: 76
electrons: 76
neutrons: 114
group: 8
period: 6
Term
Hs
 Definition
Hassium
atomic number: 108
mass number: 265
protons: 108
electrons: 108
neutrons: 157
group: 8
period:7
Term
Co
 Definition
Cobalt
atomic number: 27
mass number: 59
protons: 27
electrons: 27
neutrons: 32
group: 8
period: 4
Term
Rh
 Definition
Rhodium
atomic number: 45
mass number: 103
protons: 45
electrons: 45
neurons: 58
Term
Ir
 Definition
Iridium
atomic number: 77
mass number: 192
protons: 77
electrons: 77
neutrons: 115
group: 8
period: 6
Term
Mt
 Definition
Meitnerium
atomic number: 109
mass number: 266
protons: 109
electrons: 109
neutrons: 157
group: 8
period: 7
Term
Ni
 Definition
Nickel
atomic number: 28
mass number: 59
protons: 28
electrons: 28
neutrons: 31
group: 8
period: 4
Term
Pd
 Definition
Palladium
atomic number: 46
mass number: 106
protons: 46
electrons: 46
group: 8
period: 5
Term
Pt
 Definition
Platnium
atomic number: 78
mass number: 195
protons: 78
electrons: 78
neutrons: 117
group: 8
period: 6
Term
DS
 Definition
Darmstadtidium
atomic number: 110
mass number: 271
protons: 110
neutrons: 161
group: 8
period: 7
Term
Cu
 Definition
Copper
atomic number: 29
mass number: 63
protons: 29
electrons: 29
neutrons: 34
group: 1b
period: 4
Term
Ag
 Definition
Silver
atomic number: 47
mass number: 108
protons: 47
electrons: 47
neutrons: 61
group: 1b
period: 5
Term
Au
 Definition
Gold
atomic number: 79
mass number: 197
protons: 79
electrons: 79
neutrons: 118
group: 1b
period:6
Term
Uuu
 Definition
Element 111
atomic number: 111
mass number: 272
protons: 111
electrons: 111
neutrons: 161
group: 1b
period: 7
Term
B
 Definition
Boron
atomic number: 5
mass number:11
protons: 5
electrons: 5
neutrons: 6
group:3a
period: 2
Term
Zn
 Definition
Zinc
atomic number: 30
mass number: 65
protons: 30
electrons: 30
group: 2b
period: 4
Term
Cd
 Definition
Cadmium
atomic number: 48
mass number: 112
protons: 48
electrons: 48
neutrons:64
group: 2b
period:5
Term
Hg
 Definition
Mercury
atomic number: 80
mass number: 200
protons: 80
electrons: 80
neutrons: 120
group: 2b
period: 6
Term
Al
 Definition
Aluminum
atomic number: 13
mass number: 27
protons: 13
electrons: 13
neutrons: 15
group: 3a
period: 2
*semi-metal*
Term
Ga
 Definition
Gallium
atomic number: 31
mass number: 70
protons: 31
electrons: 31
neutrons: 39
group: 3a
period: 4
*semi-metal*
Term
In
 Definition
Indium
atomic number: 49
mass number: 115
protons: 49
electrons: 49
neutrons: 66
group: 3a
period: 5
*semi-metal*
Term
Tl
 Definition
Thallium
atomic number: 81
mass number: 204
protons: 81
electrons: 81
neutrons: 123
group: 3a
period: 6
*semi-metal*
Term
C
 Definition
Carbon
atomic number: 6
mass number: 12
protons: 6
electrons: 6
neutrons: 6
group: 4a
period: 2
Term
Si
 Definition
Silicon
atomic number: 14
mass number: 28
protons: 14
electrons: 14
neutrons: 14
group: 4a
period: 3
Term
Ge
 Definition
Germanium
atomic number: 32
mass number: 73
protons: 32
electrons: 32
neutrons: 41
group: 4a
period: 4
*semi-metal*
Term
Sn
 Definition
Tin
atomic number: 50
mass number: 119
protons: 50
electrons: 50
neutrons: 69
group: 4a
period: 5
*semi-metal*
Term
Pb
 Definition
Lead
atomic number: 82
mass number: 118
protons: 82
electrons: 82
neutrons: 36
group: 4a
period: 6
*semi-metal*
Term
N
 Definition
Nitrogen
Term
P
 Definition
Phosphorus
Term
As
 Definition
Arsenic
Term
Sb
 Definition
Antimony
*semi-metal*
Term
Bi
 Definition
Bismuth
*semi-metal*
Term
O
 Definition
Oxygen
Term
S
 Definition
Sulfur
Term
Se
 Definition
Selenium
Term
Te
 Definition
Tellurium
Term
Po
 Definition
Polonium
*semi-metal*
Term
F
 Definition
Florine
Term
Cl
 Definition
Chlorine
Term
Br
 Definition
Bromine
Term
I
 Definition
Iodine
Term
At
 Definition
Astatine
Term
He
 Definition
Helium
Term
Ne
 Definition
Neon
Term
Ar
 Definition
Argon
Term
Kr
 Definition
Krypton
Term
Xe
 Definition
Xenon
Term
Rn
 Definition
Radon
Term
Ce
 Definition
Cerium
Term
Pr
 Definition
Prasoedymium
Term
Nd
 Definition
Neodymium
Term
Pm
 Definition
Promethium
Term
Sm
 Definition
Samarium
Term
Eu
 Definition
Europium
Term
Gd
 Definition
Gadolinium
Term
Tb
 Definition
Terbium
Term
Dy
 Definition
Dysprosium
Term
Ho
 Definition
Holmium
Term
Er
 Definition
Erbium
Term
Tm
 Definition
Thulium
Term
Yb
 Definition
Ytterbium
Term
Lu
 Definition
Lutetium
Term
Th
 Definition
Thorium
Term
Pa
 Definition
Protactinium
Term
U
 Definition
Uranium
Term
Np
 Definition
Neptunium
Term
Am
 Definition
Americium
Term
Cm
 Definition
Curium
Term
Bk
 Definition
Berkelium
Term
Cf
 Definition
Californium
Term
Es
 Definition
Einsteinium
Term
Fm
 Definition
Fermium
Term
Md
 Definition
Mendelevium
Term
No
 Definition
Nobelium
Term
Lr
 Definition
Lawrencium
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