File Name: atomic number and mass number of first 30 elements .zip
Section 2. Parts 2. Sub-index for this page.
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Allotropes Some elements exist in several different structural forms, called allotropes. Each allotrope has different physical properties. For more information on the Visual Elements image see the Uses and properties section below. Group A vertical column in the periodic table. Members of a group typically have similar properties and electron configurations in their outer shell. Period A horizontal row in the periodic table. The atomic number of each element increases by one, reading from left to right.
Atoms are the fundamental building blocks of all matter and are composed of protons, neutrons, and electrons. Because atoms are electrically neutral, the number of positively charged protons must be equal to the number of negatively charged electrons. Since neutrons do not affect the charge, the number of neutrons is not dependent on the number of protons and will vary even among atoms of the same element. The atomic number represented by the letter Z of an element is the number of protons in the nucleus of each atom of that element. An atom can be classified as a particular element based solely on its atomic number. For example, any atom with an atomic number of 8 its nucleus contains 8 protons is an oxygen atom, and any atom with a different number of protons would be a different element. The periodic table see figure below displays all of the known elements and is arranged in order of increasing atomic number.
Click a column header, such as Name, to sort the table by that item. SEE Notes at the bottom of the Table. Clarke and H. Washington, Elemental composition of crustal rocks differ between different localities see article.
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