54:29 If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result?

Total energy increases.
Stored energy decreases.
Energy of motion decreases.
Total energy decreases.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;