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Periodic Table of Elements

To facilitate efficient display (and printing) via the World-Wide Web, this version of the periodic table presents atomic chemical element data in a format rotated 90-degrees counterclockwise with respect to traditional presentations. As with most periodic tables, elements in this table are ordered by atomic number (number of protons) and period.

As in Glenn T. Seaborg's extended periodic table, orbitals establish the basis for the groups in this table. Thus, lanthanides and actinides deviate from their prior historical positions as noted. Via the links at top right, orbital blocks may be included or excluded to change the table's size.

Because the period 1 elements – hydrogen (H) and helium (He) – are special cases that do not follow the octet rule, variants of this table accomodate their:

The noble gases (group 18) appear at the top of the table and alkali metals (group 1) at the bottom (ordered opposite of those in the simpler mirrored vertical periodic table.)

Data for each element are presented as described in the category and layout legends below.

Element Categories

Nonmetals
Noble GasesNG
HalogensHal
Other NonmetalsONm
MetalloidsMo

Metals
Other MetalsOM
Transition ElementsTE
Inner
Transition
Elements
LanthanidesLan
ActinidesAct
Alkaline Earth MetalsAEM
Alkali MetalsAM
Element Layout Legend
category (see left):state at standard temperature and pressure
(0°C and 1 atmosphere) as Gas, Liquid, or Solid
chemical symbol →

element name →
optional alternate name →
atomic mass (uncertainty) →
electronegativity →
magnetic ordering →
Fe(TE:S) 26
(ancient)
iron
(L.: ferrum)
55.845(2)
e-:1.83
ferromagnetic
← atomic number (protons)
← when discovered
← L.Gr.::=Latinized Greek,
← L.::=Latin, G.::=German
← for most-stable isotope
← using Pauling scale
← non-,dia-,para-,ferro-,antiferromagnetic

occurrence (via border type):
Primordial From decay Synthetic Undiscovered
(no border)

Periodic Table of Atomic Chemical Elements
Group ↓ ← Period →
Period 1 Period 2 Period 3 Period 4 Period 5 Period 6 Period 7
s2
2/IIA
Alkaline Earth Metals
 
Be(AEM:S) 4
(1828)
BERYLLIUM
9.012182(3)
e-:1.57
diamagnetic
Mg(AEM:S) 12
(1755)
MAGNESIUM
24.3050(6)
e-:1.31
paramagnetic
Ca(AEM:S) 20
(1808)
CALCIUM
40.078(4)
e-:1.00
paramagnetic
Sr(AEM:S) 38
(1793)
STRONTIUM
87.62(1)
e-:0.95
paramagnetic
Ba(AEM:S) 56
(1808)
BARIUM
137.327(7)
e-:0.89
paramagnetic
Ra(AEM:S) 88
(1898)
RADIUM
[226.0254]
e-:0.9
nonmagnetic
s1
1/IA
Alkali Metals
Li(AM:S) 3
(1817)
LITHIUM

6.941(2)
e-:0.98
paramagnetic
Na(AM:S) 11
(1807)
SODIUM
(L.: NATRIUM)
22.98976928(2)
e-:0.93
paramagnetic
K(AM:S) 19
(1807)
POTASSIUM
(L.: KALIUM)
39.0983(1)
e-:0.82
nonmagnetic
Rb(AM:S) 37
(1860)
RUBIDIUM

85.4678(3)
e-:0.82
nonmagnetic
Cs(AM:S) 55
(1860)
CAESIUM
(CESIUM)
132.9054519(2)
e-:0.79
nonmagnetic
Fr(AM:S) 87
(1939)
FRANCIUM

[223.0197]
e-:0.7
nonmagnetic

Footnotes
Historically, Group 3/IIIB includes lanthanum (La) in place of lutetium (Lu) and actinium (Ac) in place of lawrencium (Lr); as noted at top, this table models Seaborg's.
The atomic mass of ununseptium (Uus) is only an estimate, as this element has not yet been discovered.