Groups of elements that are shiny but not lustrous, have a semi-conductive property, and are brittle are classified as? A) Nonmetals
B) Metals
C) Metalloids
D) Flux capacitors

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.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

the correct answer is:

a. formation of precipitation