How many atoms are in 151 g of calcium?

When determining the shape of a molecule, it is important to draw a lewis dot structure first in order to see the total number a. electrons within the moleculeb. bonding and unshared pairs around central atomc. unshared pair within the molecule( i really need it )

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

When electrolyzing copper (ll) chloride, what reaction takes place at the anode? what reaction takes place at the cathode?