Green plants use light from the sun to drive photosynthesis. photosynthesis is a chemical reaction in which water (h2o) and carbon dioxide (co2) chemically
react to form the simple sugar glucose (c6h206) and oxygen gas (o2).
what mass of oxygen gas is produced by the reaction of 9.8 g of carbon dioxide?

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.