In 1818 there were 49 known and accepted (by the scientific community) elements.
117 elements
By 1869, a total of 63 elements had been discovered.
I believe there were 55 or 56 known elements then.
There are 118 known elements, but the number of pure elements found naturally on Earth is around 90.
112 elements have been named and additional 6 elements have been tentatively proposed.
36 elements were known in 1800.
Approx. 20 elements were known in 1800.
Approx. 25 chemical elements were known in 1800.
There are currently 118 known elements.
117 elements
By 1869, a total of 63 elements had been discovered.
118 or 119
Now are known 118 chemical elements.
112
Today are known 118 chemical elements; 98 are considered as natural elements (but some have also and an artificial origin).
Periodic Table of Elements.
Today (July 2013) 118 chemical elements are known.