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What did the gaps on Mendeleev's tabel represent?
He predicted that elements with the predicted properties would be discovered to fill in these gaps.
When Mendeleev developed the first periodic table there were approximately how many elements known?
By 1869, a total of 63 elements had been discovered.
What did Mendeleev predict about the periodic table?
The gaps in the first periodic elements described those elements which were not discovered at that time. Eg-silicon,germanium etc
Who discovered the elements of radium and polonium?
Marie Curie discovered radium and polonium.
Who discovered what elements were combined to make up water?
Dalton discovered this in 1803.
Many of the first discovered elements were named by?
many of the first discovered elements were named by greek and roman philosophers
The existence of elements was first discovered by?
Dalton
Which first elements were first discovered?
mud stone air fire
Who was the scientist that discovered the periodicity of the elements?
Mendeléev, Dmitri (1834-1907)Discovered periodicity of the elements. Compiled the first Periodic Table with elements arranged into 7 groups (1869).
Who first invented the element silicon?
Elements are discovered, they are not invented.
Where neptune and plutonium the first transuranium elements discovered?
Neptunium and plutonium were discovered in United States in 1940.
How the first twenty elements were discovered?
The first twenty element was discover when there is science in the world
Who discovered element number 6?
Element number 6 was one of the first elements discovered, so it is not widely known who discovered it.
When was magnalium discovered?
Magnalium is an alloy of other elements. It is uncertain who first manufactured it
Which two elements were discovered in the 1900s?
There were actually four elements discovered in the 1990s. Darmstadtium was discovered on November 9, 1994. Roentgenium was discovered on December 8, 1994. Copernicium was discovered on February 9, 1996. Flerovium was informally identified in January of 1999.
Why were there no more than 60 elements on the first periodic table?
Because only 60 elements were discovered / known at that time
How were the first 5 states of the US discovered?
The first five states werent discovered they were founded
