There are 118 elements know to man at this date. That is to say that man has created an atom which contains 118 protons, 118 neutrons, and 118 electrons. This fell apart as soon as it was created, as do most synthetic elements. There are only about 91 naturally occurring and semi-stable elements, the remaining 27 are scientifically lab founded..
There are currently 118 known elements on the periodic table, with elements ranging from hydrogen (atomic number 1) to oganesson (atomic number 118). These elements are organized based on their atomic number and properties, and each element has its own unique characteristics.
There are 92 naturally occurring elements on Earth.
There were 1817 elements known in 1817, as the periodic table had not yet been developed.
Baking soda, also known as sodium bicarbonate, has three elements: sodium, hydrogen, and carbon.
There are currently 118 confirmed elements on the periodic table.
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
In 1818 there were 49 known and accepted (by the scientific community) elements.
Today are known 118 chemical elements; 98 are considered as natural elements (but some have also and an artificial origin).
Today (July 2013) 118 chemical elements are known.
There were about 63 known elements.
63 elements had been discovered so far.
This question is a little ambiguous. If you mean 'how many elements have mass,' the answer is 'all elements have mass.' There are 117 known elements, and scientists theorize that there may be as many as 130 or more.