A 53-year-old man suddenly collapses and becomes unresponsive. You Witness him collapse and are the first rescuer to arrive at the scene. You find him lying motionless on the floor.
Which is the first action you should take in this situation?

a) Check his pulse
b) Start high-quality CPR
c) Start providing rescue breaths
d) Shout for nearby help

D-A-C-B

Explanation:

In that order to save this mans life.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.