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About 28 elements were discovered in the laboratory.
But after the man made preparation some elements were discovered also in nature in very extremely traces: Pm, Tc, Pu, Np, Am, Cm, Bk.
Wiki User
∙ 11y ago
Wiki User
∙ 15y agoSupernova explosions probably produce all the elements we can make and then some. However, other than their (brief) existence there, technetium and pretty much everything past plutonium are never found in nature.
Wiki User
∙ 15y agoHow many radioactive elements are made only in a laboratory?
Wiki User
∙ 10y ago2+2=5
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The millions of compounds that exist are made from approximately how many elements?
The millions of compounds that exist are made from approximately 115 elements!
What are classifying Elements?
Their properties are used to classify elements. There are many ways to classify them. The simplest is to divide them into metals and non-metals. You can organise them according to reactivity. I suspect you may be thinking of the periodic table, though I tend to think of that as a way to organise our knowledge rather than a system of classification.
What is the name for the emission of rays and particles by a radioactive material?
The name for the emissions of rays and particles by a radioactive material are called radioactive decay. There are many different types of radioactive decay that emit different rays and particles.
Who had a a keen and quick mind that led him to make important scientific discoveries but yet he never published them?
I'm sure there are many, but perhaps you are talking about Henry Cavendish. He made many discoveries, some were stolen by others, years after his death manyvolumes of his laboratory studies were made public, but I don't think he actually published anything.
How many groups are listed in the Periodic Table of Elements?
Meatals: 88 Semimeatals: 6 Nonmeatals: 18 Add: Groups 1 and 18 contain 7 elements. Groups 2, 13-16 contain 6 elements. Groups 3-12 contain 4 elements. Some periodic tables do not include all of the elements 113-118 as only a few atoms of each have been observed in the laboratory. Click on related links to see a periodic table with links to all of the elements.
How many elements are made only in a laboratory?
How many radioactive elements are made only in a laboratory?
How many artificial elements are not radioactive?
None - they are all radioactive.
Are all transition elements are radioactive?
Not all of the transition elements are radioactive. Many of them are, and some of them have common radioactive isotopes, but some of them have no naturally occurring radioactive isotopes. Please note that all elements have synthetic radioactive isotopes, at least.
What is the heaviest radioactive element?
Polonium is often considered to be the most radioactive element, but there are far more radioactive elements like nobelium and lawrencium. However, the most radioactive elements are man-made like ununtrium and ununseptium. Out of these, ununoctium is the most radioactive but scientists are continuing to make even more radioactive elements today.
Region of the periodic table where most radioactive elements are found?
Group 3 of the periodic table contains many of the radioactive elements.
Are all the radioactive elements found in the last group of the Periodic Table?
No, many other elements are radioactive or have radioactive isotopes. Examples of this are carbon 14, which is used in carbon dating, Radon, Krypton, Hydrogen, Iodine, and many others.
Is potassium natural or synthetic?
False. Potassium, elemental symbol K, is a naturally occurring metal. Synthetic elements in contrast include radioactive elements which may only exist for small amount of time in laboratory conditions.
How many radioactive elements are discovered uptill now?
40 elements are discovered uptil now
What is a radioactive decay of the spent fuel?
The nuclear fission process produces a range of lighter elements as fission products, and many of these are radioactive.
What are elements that are made in lab called?
Synthetic is the term you are looking for i believe.
What is stable elements?
Unstable elements are radioactive elements that spontaneously decay into other elements. Some are: Radon Uranium Plutonium See the related link for an article giving greater detail on isotope stability.
Which lanthanide element and which transition element have only radioactive isotopes?
All or almost all elements have radioactive isotopes if artificial isotopes are included. Among the naturally occurring elements, uranium, polonium, radium, and thorium have naturally occurring radioactive isotopes on earth.
