Atomic number - Revision history

Jmdonev: 1 revision imported

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Jmdonev at 04:08, 27 August 2017

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	[[Category:Done ~~2015~~-02-15]] [[Category:Phets]]		[[Category:Done 2017-07-01]]
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	<onlyinclude>The '''atomic number''', written as ''Z'', refers to the number of [[proton]]s in the [[nucleus]] of an [[atom]], and is used to organize the [[periodic table of elements]].<ref>(2014, Dec. 10). ''Atomic Number'' [Online]. Available: http://goldbook.iupac.org/A00499.html</ref></onlyinclude> Each chemical [[element]] has a different number of protons, so the atomic number is a unique identifier for an element. For example, 6 is always [[carbon]], 92 is always [[uranium]], and 1 is always [[hydrogen]].		<onlyinclude>The '''atomic number''', written as ''Z'', refers to the number of [[proton]]s in the [[nucleus]] of an [[atom]], and is used to organize the [[periodic table of elements]].<ref>(2014, Dec. 10). ''Atomic Number'' [Online]. Available: http://goldbook.iupac.org/A00499.html</ref></onlyinclude> Each chemical [[element]] has a different number of protons, so the atomic number is a unique identifier for an element. For example, 6 is always [[carbon]], 92 is always [[uranium]], and 1 is always [[hydrogen]].

	Atomic number should not be confused with [[mass number]], the total number of protons plus neutrons in a particular atom. When writing out descriptions of a particular atom, sometimes the atomic number is included, and sometimes it's implied from the chemical name (if the chemical name is listed as [[nitrogen]], the atomic number must be 7). When it is included, the atomic number is put in a subscript before the name of the element and the superscript before the element (14 in this case) is the mass number:		Atomic number should not be confused with [[mass number]], the total number of protons plus neutrons in a particular atom. When writing out descriptions of a particular atom, sometimes the atomic number is included, and sometimes it's implied from the chemical name (if the chemical name is listed as [[nitrogen]], the atomic number must be 7). When it is included, the atomic number is put in a subscript before the name of the element and the superscript before the element (14 in this case) is the mass number:
	<m>^{14}_{7}N</m>.		<chem>^{14}_{7}N</chem>.

	Different [[isotope]]s will have the same atomic number but different mass numbers; an example would be: <m>^{16}_{8}O</m>, <m> ^{17}_{8}O</m>, <m>^{18}_{8}O</m>.		Different [[isotope]]s will have the same atomic number but different mass numbers; an example would be: <chem>^{16}_{8}O</chem>, <chem> ^{17}_{8}O</chem>, <chem>^{18}_{8}O</chem>.

	==PhET: Build an Atom==		==PhET: Build an Atom==

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J.williams at 16:40, 12 August 2015

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[[Category:Done 2015-02-15]] [[Category:Phets]]
<onlyinclude>The '''atomic number''', written as ''Z'', refers to the number of [[proton]]s in the [[nucleus]] of an [[atom]], and is used to organize the [[periodic table of elements]].<ref>(2014, Dec. 10). ''Atomic Number'' [Online]. Available: http://goldbook.iupac.org/A00499.html</ref></onlyinclude> Each chemical [[element]] has a different number of protons, so the atomic number is a unique identifier for an element. For example, 6 is always [[carbon]], 92 is always [[uranium]], and 1 is always [[hydrogen]].

Atomic number should not be confused with [[mass number]], the total number of protons plus neutrons in a particular atom. When writing out descriptions of a particular atom, sometimes the atomic number is included, and sometimes it's implied from the chemical name (if the chemical name is listed as [[nitrogen]], the atomic number must be 7). When it is included, the atomic number is put in a subscript before the name of the element and the superscript before the element (14 in this case) is the mass number:
<m>^{14}_{7}N</m>.

Different [[isotope]]s will have the same atomic number but different mass numbers; an example would be: <m>^{16}_{8}O</m>, <m> ^{17}_{8}O</m>, <m>^{18}_{8}O</m>.

==PhET: Build an Atom==
The [http://phet.colorado.edu/ University of Colorado] has graciously allowed us to use the following PhET simulation. This simulation builds atoms from protons, neutrons, and electrons and tests knowledge of the periodic table. The simulation shows how the neutrons and protons must balance for the nucleus to be stable. Note how this simulation allows changing the atomic number and mass number.

<html><iframe src="http://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html" width="816" height="459"></iframe></html>
==References==
{{reflist}}
[[Category:Uploaded]]