Answer : The mass of lead in 139 g of is, 86.9 grams.
Explanation : Given,
Mass of = 139 g
Molar mass of = 331.2 g/mol
Molar mass of Pb = 207.2 g/mol
Now we have to calculate the mass of lead.
As, 331.2 g of has 207.2 g of lead
So, 139 g of has of lead
Thus, the mass of lead in 139 g of is, 86.9 grams.
What change did the iv cause
Calcium, because when it becomes an ion, it loses two electrons and gets rid of its M shell, decreasing its ionic radius. The rest are anions, which increase in ionic radius because the effective nuclear charge decreases.