All the elements in the same period have the same A. Valence electrons
B. Energy shells or orbitals
C. Atomic mass
D. Atomic number

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Predict the reactants of this chemical reaction. that is, fill in the left side of the chemical equation. be sure the equation you submit is balanced. (you can edit both sides of the equation to balance it, if you need to.) note: you are writing the molecular, and not the net ionic equation. > cacl2(aq) + h20(l)

What must be in balance for temperatures to remain constant?