: an experimentally determined number characteristic of a chemical element that represents the number of protons in the nucleus which in a neutral atom equals the number of electrons outside the nucleus and that determines the place of the element in the periodic table see Chemical Elements Table ...
The number of protons in an atom is the atomic number and equals the number of electrons. Atoms with atomic numbers from 1 to 92 occur naturally and others with higher atomic numbers have been made artificially by nuclear reactions. The arrangement of the electrons in an atom is determined ...
electronegative负电性的↔electropositive阳电性的（正电性的）parameter：variable参数 quantummechanics量子力学 repulsive排斥的↔attractive scale 刻度 Schematical:intheformofaschemeordiagram 图解的 solidification凝固固化/Liquefaction液化↔melting superscript上标↔subscript下标 valenceelectrons价电子 vibration振动 Ac...
All atoms except the common form of hydrogen contain protons, neutrons and electrons. The atomic number of an element is equal to the number of protons in its nucleus. In a neutral atom, the number of protons equals the number of electrons in shells which is the energy level around the ...
the atomic number equals the number of protons, which is 12. (d) a metal. this is due to the fact that metallic elements have valence electrons less than 3. (e) the element’s valency = the number of outermost electrons = 2. (f) the element in question is magnesium (mg). q12. ...
Fig.1 Expression of an element X is the chemical symbol; A is the atomic number (mass number, n0=np+ nn); Z is the proton number, which also equals the number of electrons in a neutral atom. Z is the identical number of an element and is an integral number representing the number ...
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1) atomic number (Z) :the number of protons in the nucleus For an electrically neutral or complete atom, the atomic number also equals the number of electrons. This atomic number ranges in integral units from 1 for hydrogen to 92 for uranium, the highest of the naturally ...
Atomsarecomposedofelectrons,protons,andneutrons.Theprotonsandneutronsmakeupthesmall,densenucleus.Theelectronssurroundthenucleusandoccupymostofthevolumeoftheatom.TheAtomicNumberisthenumberofprotonsanatomhas.Itneverchanges.Inneutralatomsthenumberofprotonsequalsthenumberofelectrons.Atomsize (copythisslide)...
2、rotons and neutrons make up the small, dense nucleus.the electrons surround the nucleus and occupy most of the volume of the atom. the atomic number is the number of protons an atom has. it never changes. in neutral atoms the number of protons equals the number of electrons.atom size...