What trend is seen in atom size, going down the periodic table?
a. atomic radius gets bigger the lower an atom appeares on the periodic table
b. atomic radius stays the same in a column of the period table
c. atomic radius varies the lower an atom appears on periodic table.
d. atomic radius gets smaller the lower an atom appears on the periodic table.

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

What relationship exists between an enzyme and a catalyst?