Which elements consists of a metal a matalloid and a noble gas
1) aluminum, sulfur, argon
2) magnesium, sodium, sulfur
3)sodium, silicon, argon
4)silicon, phosphorus, chlorine

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?

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

Start an single atom tab. observe the decay of polonium-211. after each decay, press the reset nucleus button to watch the process again. write a description of alpha decay for po-211