- published: 31 Oct 2015
- views: 1951877
The periodic table is a tabular display of the chemical elements, organized on the basis of their properties. Elements are presented in increasing atomic number. The main body of the table is a 18 × 7 grid, with gaps included in to keep elements with similar properties together, such as the halogens and the noble gases. These gaps form four distinct rectangular areas or blocks. The f-block is not included in the main table, but rather is usually floated below, as an inline f-block would make the table impractically wide. The periodic table accurately predicts the properties of various elements and the relations between properties. As a result, it provides a useful framework for analyzing chemical behavior, and is widely used in chemistry and other sciences.
Although precursors exist, the current table is generally credited to Dmitri Mendeleev, who developed it in 1869 to illustrate periodic trends in the properties of the then-known elements; the layout has been refined and extended as new elements have been discovered and new theoretical models developed to explain chemical behavior. Mendeleev's presentation also predicted some properties of then-unknown elements expected to fill gaps in his arrangement; these predictions were proved correct when those elements were discovered and found to have properties close to the predictions.
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This table has four sturdy legs
And a heart of very near wild oak
When others would have screamed out loud my friend
This one never even spoke
I've been sat upon, I've been spat upon
I've been treated like a bed
Been carried like a stretcher,
when someone thinks they're dead
I've been dined upon, I've been wined upon
I've been taken for a fool
Taken for a desk,
when they should have been at school
This table's been pushed against the door
When tempers, well tempers, flare at night
Banged upon with knuckles clenched my friend
When someone thinks that they are right
I've been sat upon, I've been spat upon
I've been treated like a bed
Been carried like a stretcher,
when someone thinks they're dead
I've been dined upon, I've been wined upon
I've been taken for a fool
Taken for a desk,
when they should have been at school
Tables only turn when tables learn
Put me on a bonfire, watch me burn
Treat me with some dignity, don't treat me like a slave
Or I'll turn into the coffin in your grave
I've been sat upon, I've been spat upon
I've been treated like a bed
Been carried like a stretcher,
when someone thinks they're dead
I've been dined upon, I've been wined upon
I've been taken for a fool
Taken for a desk,
when they should have been at school
Tables only turn when tables learn
Put me on a bonfire, watch me burn
Treat me with some dignity, don't treat me like a slave