You can identify an element by its density.
\(\rho = \frac{m}{V}\)
ρ - density, m - mass, V - volume
\(m=7.49 \ g \\
V=1.65 \ cm^3 \\ \\
\rho=\frac{7.49 \ g}{1.65 \ cm^3} \approx 4.54 \ \frac{g}{cm^3}\)
It's the density of titanium (Ti). The answer is (4).
