Yellow because Pangea all the continents were together
<span>The characteristics of a wave are given certain names to describe them, and this helps scientists to accurately describe any given wave. The characteristic known as frequency describes the number of waves that pass a point, and it is measured in waves per second, or Hertz, which is given the symbol Hz, but can also be described using the inverse of the SI unit for second, s^-1.</span>
Just dived both numbers by two
H.
represents hydrogen element. under non metal classification.
for others, you'll find them under metal element classification.
