'Mendeleev vs Modern' periodic table


	'Mendeleev vs Modern' periodic table
	Similarities Elements with similar properties are placed in the same group Horizontal rows are called 'periods'	Differences Mendeleev's table left gaps for undiscovered elements more elements in the modern periodic table increasing order of ATOMIC MASS NUMBER vs. increasing order of ATOMIC NUMBER Noble Gases included in modern table In the modern table, transition metals have their own area Clear difference between metals and non-metals in the modern periodic table
	Overall comparison Over time, knowledge and understanding on elements has changed and hence the modern periodic table is different to Mendeleev's periodic table.

Over time, knowledge and understanding on elements has changed and hence the modern periodic table is different to Mendeleev's periodic table.

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