define the modern periodic law?
it is about the modern periodic table
- 1 decade agoFavorite Answer
The periodic law is the principle that certain properties of elements occur periodically when arranged by atomic number. These similarities can be reflected best by a table, so that commonalities between elements appear both in rows and in columns of the table. This table is called the periodic table.Source(s): http://en.wikipedia.org/wiki/Periodic_law
- wierdos!!!Lv 41 decade ago
The modern periodic law is the law that elements, when put in order by atomic numbers, will have similar proporties every certain time. That is how the periodic table was arranged into groups. For example group 1 the Alkali Metals all have similar properties. They are all highly reactive, they all have one valence electron and they all are maluable
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- Anonymous1 decade ago
The properties of elements change with increasing atomic number in a periodic way. That's why you can stick the elements into a big chart and have the elements line up in nice families.
- 1 decade ago
The properties of the elements are a periodic function of their atomic number. (Mendeleev, who first constructed the periodic table said the properties of the elements were a periodic function of their atomic masses. That's because he didn't know about atomic numbers in 1869).
This means whn you lay out the elements, in order by atomic number, line up elements with similar properties in the same column. This way you end up with rows (called periods) and columns (called groups or families). Elements in the same column (family) have similar properties.