Why does the ionization energy decrease as you move down a group on the periodic table? More neutrons in the nucleus

More electrons in the outer energy level

The size of the atom increases

Which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other

The is a particle with one unit of positive charge a. proton b. positron c. electron d. nucleus awnser quick it is a important science test!

Compare and contrast physical changes with chemical changes.