any discoveries made by the second scientist?
He contributes  to understand atomic structure and quantum theory. He developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another.
Niels Bohr
Niels Henrik David Bohr (; 7 October 1885 – 18 November 1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research.

Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another. Although the Bohr model has been supplanted by other models, its underlying principles remain valid. He conceived the principle of complementarity: that items could be separately analysed in terms of contradictory properties, like behaving as a wave or a stream of particles. The notion of complementarity dominated Bohr's thinking in both science and philosophy.
what is the exact mass of an electron Approximately 1/1836 that of the proton is the electron a positive charge or a negative charge or is it neutral? Negative charge can you describe any experiment in short where this charge can be produced? UNANSWERABLE what are the names of the scientists who are involved in the discovery of this negative charge? J. J. Thomson what are the applications of this kind of charge? Cathode ray tubes,  computer monitors, television sets,  Vacuum tubes, etc. what are some of the experiments conducted by that scientist you mentioned? One such experiment was Cathode rays. He marked the paths of particles of matter charged with negative electricity which educational institution did he attend? Owens College in Manchester, then moved to  Trinity College what subjects did he study? He  obtained his Bachelor of Arts degree in mathematics what were some of the awards conferred to him? Fellow of the Royal Society  and appointed to the Cavendish Professorship of Experimental Physics what were the names of some of the scientists he collaborated with during his research and experimental work? Charles Glover Barkla, Niels Bohr, Max Born, William Henry Bragg
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Niels Bohr [SEP] Introduction
Niels Henrik David Bohr (; 7 October 1885 – 18 November 1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research. Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another. Although the Bohr model has been supplanted by other models, its underlying principles remain valid.