Answer is D 2 elements and a total of 3 atoms
A density of a substance is constant. It is an extensive property, meaning it does not depend on the amount of substance because it is a ratio of mass to volume. No matter how much of each there is, they would always have a fixed ratio called density. For lead, the density is
Density = mass/volume
Density = 23.94 g/ 2.10 cm³
Density = 11.4 g/cm³
NaCl:
Na = + 1
Cl = - 1
hope this helps!
I believe the answer is orbital hybridization theory