Endothermic reaction: Heat is blank by blank

Exothermic reaction:

Heat is blank as a blank

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

He table below gives the atomic mass and relative abundance values for the three isotopes of element m. relative abundance (%) atomic mass (amu) 78.99 23.9850 10.00 24.9858 11.01 25.9826 what is the average atomic mass (in amu) of element m? 2.86 5.36 24.30 24.98

Which element is least likely to undergo a chemical reaction