Which statements describe elements? Check all that apply -atoms of the same element can have different numbers of protons. A.-Atoms of the same element always have the same number of electrons. B.– Atoms of the same element can have different numbers of neutrons. C.– Atoms of the same element always have the same number of neutrons. D.– Atoms of the same element always have the same number of protons. E.– Atoms of the same element can be isotopes of that element.

Gas cloud 1 is likely to form a star. gas cloud 2 is not. based on this information, match the given conditions with each cloud

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.