Question

20 points and brainliest for best answer

Answer 1

You can find the atomic mass of each on any standard periodic table.
Gold (Au): 196.97
Potassium (K): 39.098
Francium (Fr): 223
Copper (Cu): 63.546
Bromine (Br): 79.904
Arsenic (As): 74.992
Uranium (U): 238.03
Chromium (Cr): 51.996
Mercury(Hg): 200.59
Hydrogen (H): 1.008

~I hope this helps!~

Answer 2

Gold/Atomic mass

196.96657 u ± 0.000004 u

Potassium/Atomic mass

39.0983 u ± 0.0001 u

Francium/Atomic number

87

Copper/Atomic mass

63.546 u ± 0.003 u


Bromine/Atomic mass

79.904 u ± 0.001 u


Arsenic/Atomic number

33