Which TWO of the following options are TRUE about atomic mass and mass number? A - The mass number is always the atomic mass rounded to the nearest whole number.
B - The atomic mass of an element is always the same no matter what the mass number of that particular atom is.
C - Mass number is always equal to the atomic number multiplied by 2.
D - The mass number is written on the periodic table.
E - Atomic mass is calculated by weighted atomic average using all the isotope data available.
F - Atomic mass and mass number are the same thing.
G - Mass number is equal to the sum of protons and electrons in an atom.

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