How many atoms of calcium, ca would be equal to 5.472 x 104 moles ca?

             3.29 × 10²⁸ Atoms

Solution:
              Moles and Number of atoms are related to each other as,

                           Moles  =  Number of Atoms / 6.022 × 10²³    (1)

Data Given;
                  Moles  =  5.472 ×10⁴

                  Number of Atoms  =  ?

Solving eq. 1 for Number of Atoms,

                        Number of Atoms  =  Moles  × 6.022 × 10²³

Putting values,

Number of Atoms  =  5.472 ×10⁴ mol × 6.022 × 10²³ atoms.mol⁻¹

Number of Atoms  =  3.29 × 10²⁸ Atoms

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☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts