What is an Atom?
Atoms are the basic units of matter and the defining structure of
elements. Atoms are made up of three particles: protons, neutrons and
electrons.
Protons and neutrons are heavier than electrons and reside in the
center of the atom, which is called the nucleus. Electrons are extremely
lightweight and exist in a cloud orbiting the nucleus. The electron
cloud has a radius 10,000 times greater than the nucleus.
Protons and neutrons have approximately the same mass. However, one
proton weighs more than 1,800 electrons. Atoms always have an equal
number of protons and electrons, and the number of protons and neutrons
is usually the same as well. Adding a proton to an atom makes a new
element, while adding a neutron makes an isotope, or heavier version, of
that atom
Nucleus
The nucleus was discovered in 1911, but its parts were not identified
until 1932. Virtually all the mass of the atom resides in the nucleus.
The nucleus is held together by the "strong force," one of the four
basic forces in nature. This force between the protons and neutrons
overcomes the repulsive electrical force that would, according to the
rules of electricity, push the protons apart otherwise.
Protons
Protons are positively charged particles found within atomic nuclei.
They were discovered by Ernest Rutherford in experiments conducted
between 1911 and 1919.
The number of protons in an atom defines what element it is. For example, carbon atoms have six protons, hydrogen atoms have one and oxygen
atoms have eight. The number of protons in an atom is referred to as
the atomic number of that element. The number of protons in an atom also
determines the chemical behavior of the element. The Periodic Table of the Elements arranges elements in order of increasing atomic number.
Protons are made of other particles called quarks. There are three
quarks in each proton — two "up" quarks and one "down" quark — and they
are held together by other particles called gluons.
Electrons
Electrons have a negative charge and are electrically attracted to the
positively charged protons. Electrons surround the atomic nucleus in
pathways called orbitals. The inner orbitals surrounding the atom are
spherical but the outer orbitals are much more complicated.
An atom's electron configuration is the orbital description of the
locations of the electrons in an unexcited atom. Using the electron
configuration and principles of physics, chemists can predict an atom's
properties, such as stability, boiling point and conductivity.
Typically, only the outermost electron shells matter in chemistry. The
inner electron shell notation is often truncated by replacing the
long-hand orbital description with the symbol for a noble gas in
brackets. This method of notation vastly simplifies the description for
large molecules.
For example, the electron configuration for beryllium (Be) is 1s22s2, but it's is written [He]2s2. [He] is equivalent to all the electron orbitals in a helium
atom. The Letters, s, p, d, and f designate the shape of the orbitals
and the superscript gives the number of electrons in that orbital.
Neutrons
Neutrons are uncharged particles found within atomic nuclei. A
neutron's mass is slightly larger than that of a proton. Like protons,
neutrons are also made of quarks — one "up" quark and two "down" quarks.
Neutrons were discovered by James Chadwick in 1932.
Isotopes
The number of neutrons in a nucleus determines the isotope of that
element. For example, hydrogen has three known isotopes: protium,
deuterium and tritium. Protium, symbolized as 1H, is just ordinary hydrogen; it has one proton and one electron and no neutrons. Deuterium (D or 2H) has one proton, one electron and one neutron. Tritium (T or 3H) has one proton, one electron and two neutrons.
