A. The four isotopes of lead are shown below, each with its percent by mass abundance, the composition of its nucleus and atomic masses. Using this data, calculate the average atomic mass of lead.
82p, 122n, 1.37%, 203.97 amu
82p, 124n, 26.26%, 205.97amu
82p, 125n, 20.82%, 206.98amu
82p, 126, 51.55%, 207.97 amu

The p sub shell can hold up to 8 electrons in an atom. true or false?

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm