What element does 'O' represent on the periodic table?

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

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

An alcohol thermometer makes use of alcohol's changing in order to measure temperature. as the temperature goes up, the alcohol contained in the thermometer increases in volume, filling more of the thermometer's tube.