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(N/A) Mendeleev's Periodic TableModern Periodic Table$1$. Elements are arranged in the increasing order of their atomic masses.$1$. Elements are arran

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(N/A) Mendeleev's Periodic TableModern Periodic Table$1$. Elements are arranged in the increasing order of their atomic masses.$1$. Elements are arranged in the increasing order of their atomic numbers.$2$. There are a total of $7$ groups and $6$ periods.$2$. There are a total of $18$ groups and $7$ periods.$3$. Elements with similar properties were placed in the same group.$3$. Elements with the same number of valence electrons are placed in the same group.$4$. The position of hydrogen was ambiguous.$4$. Hydrogen is placed in group $1$ above alkali metals.$5$. No clear distinction between metals and non-metals.$5$. Metals are on the left and non-metals are on the right.

Compare and contrast the arrangement of elements in Mendeleev's Periodic Table and the Modern Periodic Table.

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Mendeleev's Periodic Table	Modern Periodic Table
$1$. Elements are arranged in the increasing order of their atomic masses.	$1$. Elements are arranged in the increasing order of their atomic numbers.
$2$. There are a total of $7$ groups and $6$ periods.	$2$. There are a total of $18$ groups and $7$ periods.
$3$. Elements with similar properties were placed in the same group.	$3$. Elements with the same number of valence electrons are placed in the same group.
$4$. The position of hydrogen was ambiguous.	$4$. Hydrogen is placed in group $1$ above alkali metals.
$5$. No clear distinction between metals and non-metals.	$5$. Metals are on the left and non-metals are on the right.