"how many atoms are in 169 g of calcium"

First calculate the number of moles. Molar mass of Calcium = 40.08 g/mol

Number of moles = 169 g / (40.08 g / mol) = 4.217 moles

Using Avogadros number, we can get the number of atoms:

Number of atoms = 4.217 moles * (6.022 x 10^23 atoms / moles) = 2.54 x 10^24 atoms

chemists can use the electron cloud model to assign electrons to different atomic orbitals. atomic orbitals also explain the patterns in the periodic table

explanation:

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying