What is electron configuration? Under what condition can two electrons share the same shell or subshell?

Which best describes why nh4+ can form an ionic bond with ci-?

What natural processes produce large quantities of co2

High-pressure liquid chromatography (hplc) is a method used in chemistry and biochemistry to purify chemical substances. the pressures used in this procedure range from around 500 kilopascals (500,000 pa) to about 60,000 kpa (60,000,000 pa). it is often convenient to know the pressure in torr. if an hplc procedure is running at a pressure of 1.03×108 pa , what is its running pressure in torr?