.
Name: Indium
Symbol: In
Atomic Number: 49
Atomic Weight: 114.818
Group: Other metals
Date Discovered: 1863
Discovered By: Ferdinand Reich and Hieronymus Richter
Name: Iodine
Symbol: I
Atomic Number: 53
Atomic Weight: 126.9045
Group: Halogens
Date Discovered: 1811
Discovered By: Bernard Courtois
Name: Iridium
Symbol: Ir
Atomic Number: 77
Atomic Weight: 192.217
Group: Transition metals
Date Discovered: 1804
Discovered By: Smithson Tennant
Name: Iron
Symbol: Fe
Atomic Number: 26
Atomic Weight: 55.845
Group: Transition metals
Date Discovered: prehistoric
Discovered By: unknown
Name: Krypton
Symbol: Kr
Atomic Number: 36
Atomic Weight: 83.798
Group: Noble gases
Date Discovered: 1898
Discovered By: William Ramsay and Morris Travers
Name: Lanthanum
Symbol: La
Atomic Number: 57
Atomic Weight: 138.9055
Group: Lanthanide
Date Discovered: series 1839
Discovered By: Carl Mosander
Name: Lawrencium
Symbol: Lr
Atomic Number: 103
Atomic Weight: (260)
Group: Transition metals
Date Discovered: 1961
Discovered By: Albert Ghiorso, Torbjørn Sikkeland, Almon Larsh, and Robert Latimer
Name: Lead
Symbol: Pb
Atomic Number: 82
Atomic Weight: 207.2
Group: Other metals
Date Discovered: prehistoric
Discovered By: unknown
Name: Lithium
Symbol: Li
Atomic Number: 3
Atomic Weight: 6.941
Group: Alkali metals
Date Discovered: 1817
Discovered By: Johan Arfwedson
Name: Lutetium
Symbol: Lu
Atomic Number: 71
Atomic Weight: 174.967
Group: Transition metals
Date Discovered: 1907
Discovered By: Georges Urbain and Carl von Welsbach, independently of each other
Name: Magnesium
Symbol: Mg
Atomic Number: 12
Atomic Weight: 24.3051
Group: Alkaline earth metals
Date Discovered: 1755
Discovered By: Joseph Black (oxide isolated by Humphry Davy 1808; pure form isolated by Antoine-Alexandre-Brutus Bussy 1828)
Name: Manganese
Symbol: Mn
Atomic Number: 25
Atomic Weight: 54.938
Group: Transition metals
Date Discovered: 1774
Discovered By: Johann Gottlieb Gahn
Name: Meitnerium
Symbol: Mt
Atomic Number: 109
Atomic Weight: (268)
Group: Transition metals
Date Discovered: 1982
Discovered By: Peter Armbruster and coworkers
Name: Mendelevium
Symbol: Md
Atomic Number: 101
Atomic Weight: (258)
Group: Actinide
Date Discovered: series 1955
Discovered By: Albert Ghiorso, Bernard G. Harvey, Gregory Choppin, Stanley Thompson, and Glenn Seaborg
Name: Mercury
Symbol: Hg
Atomic Number: 80
Atomic Weight: 200.59
Group: Transition metals
Date Discovered: prehistoric
Discovered By: unknown
Name: Molybdenum
Symbol: Mo
Atomic Number: 42
Atomic Weight: 95.94
Group: Transition metals
Date Discovered: 1781
Discovered By: named by Karl Scheele (isolated by Peter Jacob Hjelm 1782)
Online Encyclopedia Blog For Kid's Research In Sciences, Health, Environment and Technology
Matter is composed of atoms or groups of atoms called molecules. The arrangement of particles in a material depends on the physical state of the substance. In a solid, particles form a compact structure that resists flow. Particles in a liquid have more energy than those in a solid. They can flow past one another, but they remain close. Particles in a gas have the most energy. They move rapidly and are separated from one another by relatively large distances.
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