When the first periodic table of the elements was published, the elements were arranged by atomic mass. although several elements seemed out of order, later discoveries showed the order to be correct. which event most likely the development of the periodic table?

scientists changed the atomic masses to better fit the pattern.
scientists refused to consider other ways to organize the elements.
new technology was developed that modified the masses.
new information changed the understanding of the atom’s structure.

Identify the error in the sentence. my cat was so enormously overweight that the vet suggested, much to my cat's dismay putting him on a diet. a. overweight c. dismay b. suggested, d. diet.

Which two particles are found in the center of an atom

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)