What does the Periodic Table tell us about the elements, their properties and behaviors? And why does the atomic number define each element?
- The structure of the atom reveals why the elements can be arranged in a particular order.
- Henry Moseley arranged elements by atomic number.
- The atomic number is the number of protons inside one atom of a particular element.
- The periodic table connects elements by atomic structure and chemical behavior.
When Mendeleev invented the periodic table in 1869, he was ahead of his time.
And one important adjustment was made to Mendeleev's masterpiece.
So all the Group 1 elements have just one outer shell electron - making them highly reactive.
The Group 7 elements - called the halogens - ...
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