Question

At STP, a 7.49-gram sample of an element has a volume of 1.65 cubic centimeters. The sample is most likely
(1) Ta (3) Te
(2) Tc (4) Ti

Answer 1

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).