1 Elements • Each element has a unique number of protons in its nucleus. – All carbon atoms have 6 protons in their nuclei. • The number of protons in the nucleus of an atom is called the atomic number. – Z is the short-hand designation for the atomic number. – Because each element’s atoms have a unique number of protons, each element can be identified by its atomic number. – The elements are arranged on the Periodic Table in order of their atomic numbers. • Each element has a unique name and symbol. – The symbol is either one or two letters • One capital letter or one capital letter + one lower case letter.
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Elements• Each element has a unique number of protons in its
nucleus.– All carbon atoms have 6 protons in their nuclei.
• The number of protons in the nucleus of an atom is called the atomic number.– Z is the short-hand designation for the atomic number. – Because each element’s atoms have a unique number of
protons, each element can be identified by its atomic number.
– The elements are arranged on the Periodic Table in order of their atomic numbers.
• Each element has a unique name and symbol.– The symbol is either one or two letters
• One capital letter or one capital letter + one lower case letter.
The Periodic Table of Elements
Atomic number
Atomic mass
Element symbol
Periodicity
= Metal
= Metalloid
= Nonmetal
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Metals• Solids at room temperature, except Hg.• Reflective surface.