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% Document Info
\author{Praneeth132006}
\pdfinfo{
  /Title (periodic-classifications-of-elements.pdf)
  /Creator (Cheatography)
  /Author (Praneeth132006)
  /Subject (PERIODIC CLASSIFICATIONS OF ELEMENTS Cheat Sheet)
}

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    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{PERIODIC CLASSIFICATIONS OF ELEMENTS Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Praneeth132006} via \textcolor{DarkBackground}{\uline{cheatography.com/147167/cs/31967/}}}
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  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Praneeth132006 \\
  \uline{cheatography.com/praneeth132006} \\
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 3rd May, 2022.\\
   Page {\thepage} of \pageref{LastPage}.
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  Measure your website readability!\\
  www.readability-score.com
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\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{X}
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Briefly about periodic table}}  \tn
% Row 0
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\mymulticolumn{1}{x{8.4cm}}{At present, 118 elements are known to us. All these have different properties. Out of these 118, only 94 are naturally occurring.} \tn 
% Row Count 3 (+ 3)
% Row 1
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\mymulticolumn{1}{x{8.4cm}}{The earliest attempt to classify the elements resulted in grouping the then known elements as metals and non metals} \tn 
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% Row 2
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\mymulticolumn{1}{x{8.4cm}}{} \tn 
% Row Count 6 (+ 0)
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\par\addvspace{1.3em}

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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Drawbacks of  D{\"o}bereiner's Triads}}  \tn
% Row 0
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\mymulticolumn{1}{x{8.4cm}}{He could identify only three triads from the elements known at that time} \tn 
% Row Count 2 (+ 2)
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\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Newlands' Law of Octaves}}  \tn
% Row 0
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\mymulticolumn{1}{x{8.4cm}}{John Newlands is an English scientist. Born In 1866} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{He  arranged the then known elements in the order of increasing atomic masses.} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{He started with the element having the lowest atomic mass (hydrogen) and ended at thorium which was the 56th element} \tn 
% Row Count 7 (+ 3)
% Row 3
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\mymulticolumn{1}{x{8.4cm}}{{\bf{He found that every eighth element had properties similar to that of the first. He compared this to the octaves found in music. Therefore, he called it the 'Law of Octaves'. It is known as 'Newlands' Law of Octaves'.}}} \tn 
% Row Count 12 (+ 5)
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{D{\"o}bereiner's Triads}}  \tn
% Row 0
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\mymulticolumn{1}{x{8.4cm}}{Johann Wolfgang D{\"o}bereiner is a German chemist. Born in the year 1817} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{He tried to arrange the elements with similar properties into groups. He identified some groups having three elements each. So he called these groups 'triads'.} \tn 
% Row Count 6 (+ 4)
% Row 2
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\mymulticolumn{1}{x{8.4cm}}{{\bf{when the three elements in a triad were written in the order of increasing atomic masses; the atomic mass of the middle element was roughly the average of the atomic masses of the other two elements.}}} \tn 
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% Row 3
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\mymulticolumn{1}{x{8.4cm}}{Some of the triads are : \{\{nl\}\}1) Li,Na,K \{\{nl\}\}                  2) Ca,Sr,Ba \{\{nl\}\}3) Cl,Br,I} \tn 
% Row Count 13 (+ 2)
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\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Drawbacks of Newlands' Law of Octaves}}  \tn
% Row 0
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\mymulticolumn{1}{x{8.4cm}}{It was found that the Law of Octaves was applicable only upto calcium, as after calcium every eighth element did not possess properties similar to that of the first.} \tn 
% Row Count 4 (+ 4)
% Row 1
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\mymulticolumn{1}{x{8.4cm}}{In order to fit elements into his Table, Newlands adjusted two elements in the same slot. we can observe that cobalt and nickel are in the same slot} \tn 
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% Row 2
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\mymulticolumn{1}{x{8.4cm}}{He did not leave any space for the further discovery of elements} \tn 
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% Row 3
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\mymulticolumn{1}{x{8.4cm}}{Newlands' Law of Octaves worked well with lighter elements only} \tn 
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% That's all folks
\end{multicols*}

\end{document}