The atomic mass and abundance of cr-50 is 49.946 amu and 4.3%. the atomic mass and abundance of cr-52 is 51.941 amu and 83.8%. the atomic mass and abundance of cr-53 is 52.941 amu and 9.5%. the atomic mass and abundance of cr-54 is 53.939 amu and 2.4%. which is the average atomic mass of chromium?
a. 53.94 amu
b. 52.19 amu
c. 52.00 amu
d. 51.94 amu

16

explanation:

the marks go by 4s

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.