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Learner Guide

The periodic table

All of the elements we have discovered are arranged in the periodic table,

which was created by a scientist called Dmitri Mendeleev in 1869.


It ordered the elements according to their atomic numbers, which was able to

show us similarities and differences in certain elements.


12          345678
H                He
LiBe          BCNOFNe
NaMg          AlSiPSClAr


The elements are arranged in periods (rows) and groups (columns).


Elements in the same group tend to have similar chemical properties such

as, in group 8, all the elements are nonreactive. The area in the middle is

referred to as the transition metals and usually, their groups are not



The periodic table also divides metals and non-metals naturally. The metals

are all on the left and the non-metals are all on the right. They have been 

indicated by a change of color here.


The clever thing that Mendeleev did was leaving blanks in the periodic table

that he created, because it allowed for the possibility of elements that hadn’t

been discovered Due to trends in the table, they were able to predict the

qualities of the missing elements, making them easier to find.

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Related topics

Atoms, elements,compounds & mixtures         Creating and Separating Mixtures

Solids-liquids-and-gases                                       Metals-and-non-metals


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