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[tex]\large\underline{\blacksquare \: \: {\rm Point \; to \: Remember-}}[/tex]
An element is represented by [tex]{\sf _zX^A}[/tex]
X = Symbol of element
Z = Atomic number = no. of proton = no. of [tex]{\sf e^-}[/tex] (if atom is neutral )
A = Mass number = no. of neutron + Atomic no.
[tex]\large\underline{\bigstar \: \: {\sf Question-}}[/tex]
Give the complete symbols for ions with the following numbers of subatomic particles :
[tex]\bullet{\bf 15\:protons, \: 16\: neutrons,\: and \: 18\: electrons }[/tex]
[tex]\large\implies{\sf Answer - P^{-3}}[/tex]
Explanation :
[tex]\implies{\sf _{15}P^{31}}[/tex]
[tex]\implies{\sf no. \: of \: proton \; is \: = 15}[/tex]
[tex]\implies{\sf no. \: of \: neutron \: is = 31-15 }[/tex]
[tex]\implies{\bf 16}[/tex]
[tex]\implies{\sf no. \; of \: electron = 15+3}[/tex]
[tex]\implies{\sf 18}[/tex]
[tex]\bullet{\bf 56\: proton, 82\: neutron, \: and \: 54\: Electron}[/tex]
[tex]\large\implies{\sf Answer - Ba^{+2}}[/tex]
Explanation :
[tex]\implies{\sf _{56}Ba^{138} }[/tex]
[tex]\implies{\sf no. \: of \: proton =56}[/tex]
[tex]\implies{\sf no. \; of \: neutron = 56-138}[/tex]
[tex]\implies{\sf 82 }[/tex]
[tex]\implies{\sf no. \: of \: electron = 56-2 }[/tex]
[tex]\implies{\sf 54}[/tex]
[tex]\bullet{\bf 13\: proton , 14\: neutron , \: 10\: electron }[/tex]
[tex]\large\implies{\sf Answer - Al^{+3} }[/tex]
Explanation :
[tex]\implies{\sf _{13}Al^{27}}[/tex]
[tex]\implies{\sf no. \; of \: proton = 13}[/tex]
[tex]\implies{\sf no. \; of \: neutron = 27-13 }[/tex]
[tex]\implies{\sf 14 }[/tex]
[tex]\implies{\sf no . \: of \: electron = 13-3}[/tex]
[tex]\implies{\sf 10 }[/tex]