)the atomic radius of main-group elements generally increases down a group because a. effective nuclear charge increases down a group b. effective nuclear charge decreases down a group c. effective nuclear charge zigzags down a group d. the principal quantum number of the valence orbitals increases e. both effective nuclear charge increases down a group and the principal quantum number of the valence orbitals increases

Enzymes affect the reactions in living cells by changing the

If 16.00g of hydrogen gas reacts with 126.73g of oxygen, how many grams of water are yielded? (both reactants are completely consumed in the reaction.)

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. she placed a ray box in front of a mirror. she changed the angle at which the light from the ray box struck the mirror and noted the corresponding angle at which the mirror reflected the light. which of the following is the dependent variable in this experiment? the mirror used to reflect the light the ray box used as the source of light angle at which the light from the ray box strikes the mirror angle at which the mirror reflects the light from the ray box