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Chemical patterns
The periodic table
Chemists arranged elements in periodic table, helps make sense of elements and their compounds,
how they will predict etc.

ProtonsElements arranged in Proton number (atomic as well), this is the number of positive
protons in each atom. It's written under each element in the table.…

Page 2

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Melting points of some group 1 elements
Element Symbol of element Melting point/°C


Lithium Li 181


Sodium Na 98


Potassium K 63


Rubidium Rb ?


Caesium Cs 29


Melting point shows a pattern, rubidium between 6329 degrees. And it's possible to predict properties of
elements in the same group.




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