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Additional elements have been discovered and added including the synthetic elements. Some of the previously "synthetic" elements have been discovered to be naturally occurring, and have been changed to reflect this. The Atomic Mass calculations have been improved.
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The oldest known elements in the periodic table are the ones with?
the oldest known element in periodic table is copper -8000 years old know element thank you
What is the name of the lightest element on the periodic table How and who discovered it?
Hydrogen is the lightest element on the periodic table. Henry Cavendish collected Hydrogen by placing Zinc in an acid and originally called it inflammable air. However, Paracelsus of Switzerland had noticed 250 years before that Iron placed in acid gave off a gas and that gas would burn: but did not study it further.
What is the longest lasting synthetic periodic element?
A good candidate would be curium 247 (247Cm), which has a half-life of 1.56 × 107 years. That's 15,600,000 years (15.6 million years).
How many periodic tables are there?
There is one standardized periodic table that is widely used in science and education. However, variations and alternative versions of the periodic table have been proposed over the years to highlight specific properties, trends, or categories of elements.
What prediction did Mendeleev make that came true in less than 20 years later?
Mendeleev's prediction that there were elements missing from the periodic table was confirmed when gallium was discovered in 1875 and germanium in 1886, fulfilling the gaps Mendeleev had left in his periodic table.
How many elemets were in the periodic tabel in 1834?
There were around 52 known elements in the periodic table in 1834. The periodic table was still in its early stages of development during this time, and many elements were discovered and added to the table in the years that followed.
What is an example of a change that is slow and periodic fast and non periodic fast and periodic slow and non periodic?
What is your definition of slow? Minutes, years, eons? Some that might do: slow and periodic: the progression of the seasons fast and non-periodic: an explosion fast and periodic: the swing of a pendulum slow and non-periodic: the weathering of rocks.
Why is group 7 of the periodic table known as halogens?
it is what scientists used to use years and years and years and years and years ago.
What is ifsc code for icicibank KK Nagar branch chennai?
It is same as the Ashok Nagar First Avenue Branch. The branch was shifted to KK Nagar more than two years before but the address is not chenged yet in the web site for IFSC code search. The IFSC code ICIC0000077
How many years after Robert boyle did it take scientists to formulate the periodic table of elements?
It took about 160 years after Robert Boyle's time for scientists to formulate the periodic table of elements. The periodic table was created by Dmitri Mendeleev in 1869, building on the work of many other chemists who contributed to our understanding of elements and their properties in the intervening years.
Which comet appears every 10000 years?
There are no known periodic comets with periods near 10K years.
Why did it take 20 years for chemists to finally accept the periodic table?
Many modifications were done. Finally moseley's periodic table was accepted.
How long did it take to create the periodic table?
it toke 2 years
The oldest known elements in the periodic table are the ones with?
the oldest known element in periodic table is copper -8000 years old know element thank you
What is radon's standard state?
Radon is a noble gas (non-metal) in the periodic table so it appears in the atmosphere as radioactive gas with a quantity of about 0.01%. the standard state of Radon is gas in atmosphere so it is placed in periodic table as gas...the gas exist since billion of years and history of periodic table is thousands of years....
Does the government have a secret periodic table?
Please, don't be ridiculous ! Chemistry is a science, the periodic table has a history of approx. 150 years; any link with any conspiration theory.
How did scientist discover the periodic table over the years?
Please see this article for more details.
