TCC Biology Class
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What is an Element
is a substance that cannot be broken down to other substances by chemical reactions.
is a substance consisting of two or more different elements combined in a fixed ration.
Of the 92 natural elements, about 20-25% are essential elements that an organism needs to live a healthy life and reproduce.
are required by an organism in only minute quantities. Some trace elements, such iron are needed by all forms of life, others are required only by certain species.
is the smallest unit of matter that still retains the properties of an element.
A unit of measurement for atoms and subatomic particles.
the number of protons
the number of neutrons
the difference between atomic forms of the same element are called isotopes of the element.
because neutorns and protons each have a mass very close to 1 Dalton, the mass number is an approximation of the total mass of an atom.
is one in which the nucleus decays spontaneously, giving off particles and energy.
is defined as the capacity to cause change-for instance by doing work
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