Why do atoms of group 1 elements lose electrons to form cations whereas atoms of group 17 elements gain electrons to form anions?

Which feature of a heating curve indicates a change ofn state

If you visited mount shasta city (elevation 900 m [3000 ft.]) and found the outside air temperature to be 27°c (81°f), what would be the air temperature at the summit of mount shasta (elevation 4200 m [14,000 ft.]) at that moment-assuming that the temperature conditions with altitude change at an average, or normal, lapse rate?

Adiagram show how a converging lens can produce a real image and virtual image