.
Name: Neodymium
Symbol: Nd
Atomic Number: 60
Atomic Weight: 144.24
Group: Lanthanide
Date Discovered: series 1885
Discovered By: Carl von Welsbach
Name: Neon
Symbol: Ne
Atomic Number: 10
Atomic Weight: 20.1798
Group: Noble gases
Date Discovered: 1898
Discovered By: William Ramsay and Morris Travers
Name: Neptunium
Symbol: Np
Atomic Number: 93
Atomic Weight: (237)
Group: Actinide
Date Discovered: series 1940
Discovered By: Edwin McMillan and Philip Abelson
Name: Nickel
Symbol: Ni
Atomic Number: 28
Atomic Weight: 58.6934
Group: Transition metals
Date Discovered: 1751
Discovered By: Axel Cronstedt
Name: Niobium
Symbol: Nb
Atomic Number: 41
Atomic Weight: 92.9064
Group: Transition metals
Date Discovered: 1801
Discovered By: Charles Hatchett
Name: Nitrogen
Symbol: N
Atomic Number: 7
Atomic Weight: 14.0067
Group: Nonmetals
Date Discovered: 1772
Discovered By: Daniel Rutherford
Name: Nobelium
Symbol: No
Atomic Number: 102
Atomic Weight: (259)
Group: Actinide
Date Discovered: series 1958
Discovered By: Albert Ghiorso, Torbjørn Sikkeland, J. R. Walton, and Glenn Seaborg
Name: Osmium
Symbol: Os
Atomic Number: 76
Atomic Weight: 190.23
Group: Transition metals
Date Discovered: 1804
Discovered By: Smithson Tennant
Name: Oxygen
Symbol: O
Atomic Number: 8
Atomic Weight: 15.9994
Group: Nonmetals
Date Discovered: 1774
Discovered By: Joseph Priestley and Karl Scheele, independently of each other
Name: Palladium
Symbol: Pd
Atomic Number: 46
Atomic Weight: 106.42
Group: Transition metals
Date Discovered: 1804
Discovered By: William Wollaston
Name: Phosphorus
Symbol: P
Atomic Number: 15
Atomic Weight: 30.9738
Group: Nonmetals
Date Discovered: 1674
Discovered By: Hennig Brand
Name: Platinum
Symbol: Pt
Atomic Number: 78
Atomic Weight: 195.08
Group: Transition metals
Date Discovered: 1557
Discovered By: Julius Scaliger
Name: Plutonium
Symbol: Pu
Atomic Number: 94
Atomic Weight: (244)
Group: Actinide
Date Discovered: series 1940
Discovered By: Glenn Seaborg, Edwin McMillan, Joseph Kennedy, and Arthur Wahl
Name: Polonium
Symbol: Po
Atomic Number: 84
Atomic Weight: (209)
Group: Other metals
Date Discovered: 1898
Discovered By: Marie and Pierre Curie
Name: Potassium
Symbol: K
Atomic Number: 19
Atomic Weight: 39.0983
Group: Alkali metals
Date Discovered: 1807
Discovered By: Humphry Davy
Name: Praseodymium
Symbol: Pr
Atomic Number: 59
Atomic Weight: 140.908
Group: Lanthanide
Date Discovered: series 1885
Discovered By: Carl von Welsbach
Name: Promethium
Symbol: Pm
Atomic Number: 61
Atomic Weight: (145)
Group: Lanthanide
Date Discovered: series 1945
Discovered By: J. A. Marinsky, Lawrence
Name: Protactinium
Symbol: Pa
Atomic Number: 91
Atomic Weight: 231.036
Group: Actinide
Date Discovered: series 1913
Discovered By: Kasimir Fajans and O. Göhring
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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