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CHAPTER 6 - PERIODICITY
1.
Looking at the periodic table, determine the number of valence electrons in each element.
a. Se ______
2.
b. Cs
_______
Which element has the larger radii? (Circle your choice for each.)
a. Na
Mg
b. B
Ga
Which particle has the larger atomic radii? (Circle your choice.)
4.
Which atom in each of the following pairs of atoms would have the highest first ionization
energy?
a. Ca
5.
F
b. Mg Ba
Which elements with the following atomic numbers are most nearly alike? (a, b, c)
a. 7, 8, 9
b. 6, 14, 32
6. State the number of electrons in Ca +2 ion.
_______________________
A group of elements is identified as having a valence configuration of s2p2.
a.
What is the name given to this group?
b.
Identify the three lightest elements in this group.
____________________
9.
c. 4, 12, 19
___________
7. Rb+1 has what noble gas electron configuration?
8.
F
F-1
3.
_________________________
____________________
____________________
Which elements have the following electron configurations?
a.
1s22s22p63s23p64s1
_______________________
b. 1s22s22p63s23p64s5
_______________________
10. In each of the following pairs, which element is the most electronegative?
a. Cl
Al
b. C
F
c. Ca
Kr
11. Which of the following have large (high) electron affinities and which have small (low)?
Alkali metals
HIGH
LOW
Halogens
HIGH
LOW
Noble gases
HIGH
LOW
12. Consider a neutral atom with 53 protons and 74 neutrons to answer the following questions.
a.
____________________ What is its atomic number?
b.
____________________ What is its atomic mass?
c.
____________________ Is the element’s position in a modern periodic table
determined by its atomic number or by its atomic mass?
13. Consider an element whose outermost electron configuration is 4s23d104px.
a.
____________________ To which period does the element belong?
b.
____________________ If it is a halogen, what is the value of “x”?
c.
____________________ The group number will equal (10 + 2 + x). True or False?
14. ____________________
Metalloids are found in which block, s, p, d, or f?
15. ____________________
The hardest, densest metals are found in which block?
16. ____________________
Name the most chemically active halogen.
17. ____________________
Write the electron configuration for the element in #16
18. ____________________
Write the electron configuration for the most stable ion #16
makes.
19. Referring only to the periodic table, answer the following questions on periodic trends.
a.
____________________ Which has the larger radius, Al or In?
b.
____________________ What has the larger radius, Se or Ca?
c.
____________________ What has the larger radius, Ca or Ca+2
d.
____________________ Which has greater ionization energies as a class, metals or
nonmetals?
e.
____________________ Which has a greater ionization energy, As or Cl?
f.
____________________ An element with a large negative electron affinity is most
likely to form a positive ion, a negative ion, or a neutral ion?
g.
____________________ Which element has a greater electron affinity, B or N?
h.
____________________ Which element has the greater electronegativity, P, or I?
i.
____________________ Which element has more valence electrons, Ca or Cr?
20. Indicate the trend for each periodic trend.
a.
Ionization energy
across a period
______________________________
b.
Ionization energy
down a group
______________________________
c.
Electronegativity
across a period
______________________________
d.
Electronegativity
down a group
______________________________