Sorry for the scribbles lol
Answer:
The molar mass of Pb(Cr2O7)2 is 639.2 g/mol.
Answer:
Americium is: [Rn]5f^7s^2
Bismuth is: [Xe]6s^24f^145d^106p^3
Tin is: [Kr]4d^105s^25p^2
Vanadium is: [Ar]3d^34s^2
Aluminum is [Ne]3s^23p^1
Descriptive or Correlational. hope this helps