Valence electrons: (Select all that apply) Select all that apply:
are in the highest energy level.
are not involved in bonding.
participate in the formation of chemical bonding.
occupy the inner shell orbitals.

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

Can someone me with 3 and 4 plz. this is for masteries test.

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?