The energy needed to remove an electron is called ionization energy. Which of the statements are true of ionization energy and its trends found in the periodic table?

increases going down a column (top to bottom)

decreases going across a row (left to right)

increases going across a row (left to right)

decreases going down a column (top to bottom)

What is the percent by mass of oxygen in fe2o3

Which of your 24 wells had indications that a chemical reaction occurred? how were you able to tell that a chemical reaction occurred? which of your 24 wells had indications that a physical reaction occurred? how were you able to tell that a physical reaction occurred? report on both mixing and evaporation. make a general statement about whether your hypotheses were validated or rejected. must your hypotheses be correct for this to be a successful laboratory?

The semi-conductors on the periodic table are classified as