Problem Set #5 CHEM 1180 – Spring 2017 Name: Due Monday, October 2 nd at the beg

Question

Problem Set #5           CHEM 1180 – Spring 2017               Name:

Due Monday, October 2nd at the beginning of class.

1. (2 point) In each set below circle the atom or ion that has the largest radius.

a. N         or         O

b. N         or         P

c. Na      or         Mg

d. O         or         O2-

e, Li        or         Li+

f. Mg2+    or        Ca2+

g. O2-     or         F-

h. Na+    or         F-

i. Ca2+   or        Cl-

j. Fe2+   or         Fe3+

2. (1 point) In each pair below circle the atom with the smallest first ionization energy (IE1).

a. Li   or Be

b. Li or Na

c. Mg or K

d. Be or Mg

3. (1 point) In each pair below circle the atom with the largest second ionization energy (IE2).

a. Li   or Be

b. Li or Na

c. Mg or K

d. Be or Mg

4. (1 point) In each pair below circle the atom with the largest lattice energy.

a. LiF   or   LiCl

b. MgO or CaO

c. LiF or CaO

d. Na2S or K2S

5. (5 point) Draw the Lewis structure for each of the following. NH3, SO2, OCl2, CO32-, NH4+, CS2.

Explanation / Answer

Ans 1 :

The size of atom or ion largely depends on atomic number of the element , its net effective charge which in turn is dependent on the number of electrons and protons present in the atom.

So here , the one with larger radius is :

a) N

b) P

c) Na

d) O2-

e) Li

f) Ca2+

g) O2-

h) F-

g) Cl-

h) Fe2+

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