Honors Chemistry Assignment Sheet With Answer Key

Honors Chemistry Assignment Sheet With Answer Key - Unit 3 Page 5

Honors Chemistry

= 34 protons and 36 electrons

has a larger radius because it’s 34 protons in its nucleus do not have the same power to pull

electrons as Rb with 37 protons.

7.Account for the following observations using principles of atomic structure. In each part, your answer

must include specific information about both substances.

a) The Ca

and Cl

are isoelectronic (aka have the same number of electrons), but their radii are not the

same. Which ion has the larger radius? Explain.

= 20 protons and 18 electrons

= 17 protons and 18 electrons

has a larger nucleus because of the weaker pull on electrons by the nucleus.

b) Atomic size decreases from Na to Cl in the periodic table.

As you move across the row the number of protons in the nucleus increase (ex. Na = 11

and Cl =

) because the number on the energy levels remains at 3. Therefore, Cl with 17

protons pulls on

the electrons more tightly.

c) The first ionization of K is less than that of Na.

Ionization = energy required to remove an electron.

K has 4 energy levels and Na has 3 energy levels. The electrons on the 4

energy level are more

shielded from the attractive forces, of the nucleus and therefore they are more easily removed.

Honors Chemistry Assignment Sheet With Answer Key - Unit 3 Page 5