the scientist who discovered the electrons is Joseph John Thomson or simply john thomson.
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J.J.Thomas discovered that atoms have negatively charged particles called electrons. He discovered this using the Cathode Ray. The cathode ray is a beam of electrons emitted by the cathode of an electrical discharged tube.
No element with 121 electrons has yet been discovered (as of December 2016).
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the scientist who discovered the electrons is Joseph John Thomson or simply john thomson.
i have no idea when it was discovered
The ruins of seven cities have been discovered in Delhi.
There are more than 22,000 recognized species of annelids, which are segmented worms commonly found in marine, freshwater, and terrestrial environments.
he discovered electrons
Positive charge particles are called Protons Negatively charged particles are called Electrons Neutrons have no charge Protons was discovered by Ruther Ford Electrons was discovered by JJ Thompson Neutons was discovered by James Chadwick
No-one knows, they haven't been discovered
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up to 120 elements 14 can be the maximum no. of valence electrons if any element with atomic no.greater than 120 is discovered its maximum no. of valence electrons would be 18