Which statement explains why neon is a group 18 element?
(1) neon is a gas at stp.(2) neon has a low melting point.
(3) neon atoms have a stable valence electron configuration.
(4) neon atoms have two electrons in the first shell.

In the reading, yao chen-yuan describes traveling to deliver a message. why was he willing to risk danger to travelto tientsin? he wanted to the boxers with their cause

Explain what happens at the saturation point when adding salt to water at room temperature.

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.