Which compound forms a powerful acid and also contains a halogen?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume

Which of the following statements is true about energy quantization at the atomic level? electrons in the outermost orbits are the most stable. electrons in all the orbits around the nucleus have the same amount of energy. electrons in the orbit closest to the nucleus have the least amount of energy. electrons absorb or release the same amount of energy independent of the energy levels.