The highest elevation mt. zembat in alaska 40 years ago was measured at 7600 feet. today the highest elevation is 7598 feet. what is the rate of change in elevation for this mountain?

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.