Answer:
2.55 moles
Explanation:
Please see the step-by-step solution in the picture attached below.
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Explanation:
the best way to understand the age of the earth is to estimate the age of matirials in it
The answer is Ra
Atomic number for Be is 4
Atomic number for Mg 12
Atomic number for Ra 88
Atomic number for Ba 56
By sharing electeons with each other
if they lose or gain electrons then they only form ions
they cannot lose neutrons as they are locked inside the nucleus