Gallium, Silicon and Aluminum
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-Peter
Graphite is a mineral that does not leave a clear streak.
leave your home so you can see your friends and family's
You can click start and leave the mission or you have to finish it
It is not advisable to leave a trickle charger on your battery when starting the vehicle.
As glaciers retreat, they leave behind deposits of rocks.
Because those elements were not known when he formulated his periodic table.
Mendeleev left 3 blank spaces for the elements that had not yet been discovered.
Mendeleev left blank spaces because certain elements on the Periodic Table were not known at that time. He knew that in the future, those elements would be found and placed on the periodic table.
Because those elements were not known at the time of Dmitri Mendeleev.
Mendeleev left spaces for undiscovered elements. He named them eka-aluminium, eka-silicon etc.
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There is no specific reason mentioned for why Dmitri Mendeleev left blank spaces on the periodic table. It is believed that he left these spaces to accommodate elements that were yet to be discovered or to demonstrate the existence of elements with certain properties that were predicted but not yet confirmed. These blank spaces eventually led to the discovery of new elements and validated Mendeleev's periodic table.
Mendeleev thought about the future and realized that it was entirely unlikely that all earthly elements had been discovered, so he left blank spaces in his table and even predicted some of the elements that would fit in those spaces. Surprisingly enough, as time passed, chemists began discovering many of the elements that he had predicted, which fit perfectly into his periodic table.
Because those elements were not discovered at the time Mendeleev proposed the periodic table.
Kepler was a mathematician, astronomer and astrologer. He did no work with the periodic tabel, which hadn't been discerned yet, at any rate - that was Mendeleev, some centuries later.
Scientists suggest Mendeleev left gaps in the periodic table because Mendeleev knew the elements existed; however, was unable to prove it.
At the time the periodic table was first devised, there were many elements that had not yet been discovered. Their existence could be inferred, but they couldn't actually be put into the table until they were discovered.When the periodic table was first devised, there were lots of elements that had not been discovered yet.