Question

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Answer 1

Answer:

W.C. Röntgen reported the discovery of X-rays in December 1895 after seven weeks of assiduous work during which he had studied the properties of this new type of radiation able to go through screens of notable thickness. He named them X-rays to underline the fact that their nature was unknown.

Answer 2

Electrons themselves have a negative charge. When you add an electron to an atom that is neutral, the atom becomes negatively charged. Take Sodium (Na) for example. It has 11 (positive) protons and 11 (negative) electrons - it's neutral.