Which one of the following will have the largest number of atoms?
(i) 1 g Au (s)
(ii) 1 g Na (s)
(iii) 1 g Li (s)
(iv) 1 g of `Cl_2`(g)

Explanation

To determine which of the given substances has the largest number of atoms in 1 gram, we will calculate the number of moles for each substance and then convert that to the number of atoms using Avogadro's number (approximately \(6.022 \times 10^{23}\) atoms/mol).

### Step 1: Calculate the number of moles for each substance.

1. **For Gold (Au)**:
- Molar mass of Au = 197 g/mol
- Moles of Au = \(\frac{1 \text{ g}}{197 \text{ g/mol}} = 0.00508 \text{ mol}\)

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