What is common to all elements in the same group on the periodic table?

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Asample of freon gas has a volume of 2.23 liters, a pressure of 4.85 kpa, and a temperature of -1.36°c. calculate the volume at a pressure of 1.38 kpa and a temperature of 5.5°c. (show work)

Answer asap need by wednesday morning calculate the ph of 0.036m naoh best answer will be brainliest