These are the transition elements found between groups 2A and 3A of the Periodic Table. In general chemistry we speak of the first transition series (i.e. Scandium to Zinc - though Zinc is not always considered to be a true transition element); the second transition series (Ytterium to Cadmium) and the third transition series (Lanthanum to Mercury).
Transition metals and their compounds find frequent use as industrial catalysts. Many of their compounds are coloured and they also have multiple valencies (that's why Zinc is not always considered a transition metal).
Iron is unique among the elements because it is essential for many biological processes in living organisms, such as oxygen transport in the blood and energy production in cells.
By the year 1700, about 13 elements had been identified, including carbon, sulfur, copper, iron, and mercury.
Light, and the entire electro-magnetic spectrum, is made up of photons, which are not elements. Electricity is composed of energized electrons - again, not elements. Lastly, gravity, the strong, and the weak forces are not made of elements (if they are made of things at all).
passive elements
It is helpful to organize things by characteristics because you can tell that certain elements are similar. For example if you knew nothing about the chemical or physical properties of (Rb) Rubidium, you could guess it has properties similar to (Cs) Cesium since they are in the same group. The common "Periodic Table" has many interesting forms. Search: "periodic table"
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118 elements
There are 118 elements on the periodic table.
92 elements
NaCl has two elements: sodium (Na) and chlorine (Cl).
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.
who discribed many elements of the modern digital computer ? who discribed many elements of the modern digital computer ?
118 elements
8 elements
118 elements
There are 118 elements in the periodic table.
118 elements