An element that has the same ground state valence-shell electron configuration as silicon is
magnesium
lithium
gallium
lead
argon

Apeak with a retention time of 407 s has a width at half-height (w1/2) of 7.6 s. a neighboring peak is eluted 17 s later with a w1/2 of 9.4 s. a compound that is known not to be retained was eluted in 2.5 s. the peaks are not baseline resolved. how many theoretical plates would be needed to achieve a resolution of 1.5?

Which best explains why an iceberg floats?

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?