How many atoms are in 35.5 g of chlorine? a. 3 × 10^23 atoms b. 6.02 × 10^23 atoms c. 1.2 × 10^24 atoms d. 3 × 10^24 atoms (not d)

Option (B) is the correct answer.

Explanation:

According to Avogadro's number, one mole of a substance contains atoms or molecules.

As molar mass of chlorine is 35.5 g/mol. Hence, calculate its number of moles as follows.

                   No. of moles =

                                         =

                                         = 1 mol

Therefore, number of atoms present in 1.01 mol are calculated as follows.

                            atoms/mol

                              = atoms

Therefore, we can conclude that there are atoms in 35.5 g of chlorine.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.