How much heat energy will a 25 gram piece of aluminum with a specific heat of.90J/gºC absorb if the temperature
changes from 28°C to 54°C?

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.

elements make up everything, and they combine to make compounds.

the answer is c