There are four naturally occurring isotopes of

the element chromium. The relative abundance

of each is

50Cr 4.345% 49.946044 amu

52Cr 83.789% 51.940508 amu

53Cr 9.501% 52.940649 amu

54Cr 2.365% 53.93880 amu

Find the average atomic mass of chromium.

1. 51.996 amu
   
2. 53.2503 amu
   
3. 52.061 amu
   
4. 52.978 amu