Aluminum (al) has an atomic number of 13 and an atomic mass of 27. which of the following correctly shows the electron arrangement for aluminum?

a: 2, 11
b: 2, 8, 1
c: 2, 8, 3
d: 2, 8, 17

Acylinder is filled with 2.00 moles of nitrogen, 3.00 moles of argon and 5.00 moles of helium. if the gas mixture is at stp, what is the partial pressure of the argon

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

What is the molar mass of potassium nitrate, kno3