Dmitry mendeleyev was the first to a. discover the structure of the atom b. make a workable classification of the elements c. discover radioactivity d. propose that no particles of matter can move faster than the speed of light

How many neutrons does element x have if it’s stormy umber is 33 and it’s mass number is 95?

Name the non metal condut electricity

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?