Answer
The identity of "Z" is the element Palladium (Pd).
Work Step by Step
1. Convert the number of atoms to number of moles of atoms:
$4.61 \times 10^{21} atoms \times \frac{1 mole}{6.022 \times 10^{23}atoms} = 0.00766$ $moles$
2. Calculate the molar mass of the compound.
$\frac{0.815g}{0.00766moles} = 106g/mol$
3. Since the molar mass is numerically equal to the atomic weight, we can use a periodic table to identify the element with molar mass equal to 106g/mol.
- It is Palladium (Pd)
