Two isotopes of carbon are known: Carbon-12 and carbon-13. There relative abundances are 98.9% and 1.19 % respectively. Calculate the average atomic mass of carbon.

trigonal pyramidal

tetrahedral

trigonal planar

bent

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)