7. A 200 g piece of silver is cooled from 60°C to 31°C. What is the change in thermal energy? (hint, don't forget to change g to kg) answer given work​

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

answerlinnaeus;