What is the name of the element with a valence electron configuration of 4s^2

*will mark you brainliest + 15 points ** why does the equilibrium of a system shift when the pressure is increased? a. to maximize the stress on the system b. to stop restoring equilibrium to the system c. to increase the total moles of gas in the system d. to decrease the total moles of gas in the system

Compare and contrast physical changes with chemical changes.

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled