In the unit cell of galena, six square faces of equal size each form 90 degree angles with every adjacent face. what type of crystal system is this?

tetragonal
hexagonal
triclinic
cubic

Answer : The correct option is, Cubic.

Explanation :

As there are seven types of crystal systems which are cubic, tetragonal, orthorhombic, monoclinic, triclinic, rhombohedral and hexagonal.

A unit cell is characterized by the axial length (a, b and c) and axial angle parameters which decide the size and shape of the unit cell.

In tetragonal crystal system, and

In hexagonal crystal system, and

In triclinic crystal system, and

In cubic crystal system, and

Hence, the correct option is, Cubic.

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

quartz

explanation: