Monday, April 18, 2011

Atomic Structure

Today we have learn the atomic structure of an atom. There are three parts to consist an atom: Proton, Neutron and Electron.

Atomic Number: The number of protons found in the nucleus of an atom that atoms have no overall electrical charge. Atomic Number= number of protons= number of electrons



Subatomic Particles
Ions:
Most atoms are capable of either gaining or losing electrons. A few elements, like hydrogen, are able to do both. They can do this by accepting electrons from , or giving electrons to, other atoms. Atoms that have gains or lost electrons are called ions.
Mass Number:
The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.


Atomic Mass:
The atomic mass (ma) is the mass of a specific isotope, most often expressed in unified atomic mass units.The atomic mass is the total mass of protons, neutrons and electrons in a single atom (when the atom is motionless).

Isotopes:
Isotopes are variants of atoms of a particular chemical element, which have differing numbers of neutrons. Atoms of a particular element by definition must contain the same number of protons but may have a distinct number of neutrons which differs from atom to atom, without changing the designation of the atom as a particular element.

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