What is another common name for the lanthanoids on the periodic table?

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Which type of orbits are found in the principal energy level n = 2 a - s b - s, f c - s, d d - s, p e - s, p, d

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.