The element lead (pb) consists of four naturally occurring isotopes with masses of 203.97302, 205.97444, 206.97587, n 207.97663 amu. the relative abundances of these four isotopes are 1.4, 24.1, 22.1 and 52.4%, respectively. from this data, calculate the atomic mass of lead.

The atomic mass of lead is: 207.216 u

Explanation:

data                 Isotopes                     mass                      percent

                             1                      203.97302                      1.4

                             2                     205.974444                    24.1

                            3                      206.97587                       22.1

                            4                      207.97663                       52.4

atomic mass = (203.97302x 0.014) + (205.974444 x 0.241) +

                        (206.97587 x 0.221) + (207.97663 x 0.524)

atomic mass = 2.856 +49.639 + 45.742 + 108.979

atomic mass = 207.216 u

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be