Name Francis Scott
Periodic Table and Periodic Trend REVIEW
1. Who was the first scientist to arrange elements by their atomic mass?
Mendeleev
2. Which scientist rearranged elements by atomic number?
Mosley
3. Define the following:
a. Periodic Law: Properties repeat periodically when elements are organized by
increases atomic number
b. Electronegativity The ability of an atom to attract electrons from another atom or
molecule
c. Ionization energy The amount of energy required to remove an electron from an
atom
4. On the periodic table…
The horizontal rows found on the periodic table are called periods
While the vertical columns are called groups or families
5. What are the most reactive metals on the periodic table are in group?
Alkali metals
6. Electronegativity _______________(increases/decreases) going down groups and
_______________ (increases/decreases) going across periods from left to right.
7. Ionization Energy _______________ (increases/decreases) going down groups and
_______________ (increases/decreases) going across periods from left to right.
8. Atomic size ___________________ (increases/decreases) going down groups and
_______________ (increases/decreases) going across periods from left to right.
Name Francis Scott
9. What happens to the number of valence electrons as you move down a group?
They remain the same
What happens to valence electrons as you move across from left to right a periodic
table? Valence electrons increase
10. What is the most electronegative element on the periodic table? Fluorine!
11. What is largest atom on the periodic table? Francium
12. What element has the highest ionization energy? helium
13. Why does atomic radius increase as you go down a group? Energy levels are added
14. Why does ionization energy decrease as you down a group? Atomic radius gets larger so
electrons are further from the nucleus
15. Why are cations less than the radius of their neutral ions? Cations lose electrons
resulting in a loss of an energy level
Using trends, answer the following questions
16. Which of the following has a bigger atomic radius – Cesium or Calcium? (Circle one.)
17. Which of the following has the higher ionization energy – Potassium or Sulfur? (Circle
one.)
18. Rank the following elements from smallest to largest atomic radius: iron, bromine,
cesium, tungsten
(Smallest ) Bromine, Iron, Tungsten, Cesium (largest)
19. Rank the following elements from lowest to highest electronegativity: Neon, Sulfur,
Chlorine, Silicon
(lowest) Neon, Silicon, Sulfur, Chlorine (highest)
**neon is a noble gas and does not have electronegativity!
Name Francis Scott
20. Rank the following elements from lowest to highest ionization: Magnesium, Strontium,
Calcium, Beryllium
(lowest) strontium, calcium, magnesium, beryllium (highest)
Fill in the chart below
Name
Symbol
Neon
Ne
Sodium
Na
Family/
Group
Noble Gas 18
Alkali Metal
Period
Valence e-
2
Atomic
#
10
8
Likely
Charge
0
Metal/NonMetal/
Metalloid
nonmetal
3
11
1
+1
metal
Antimony
Sb
X
5
51
5
-3
metalloid
barium
Ba
Alkaline
6
56
2
+2
metal
3
17
7
-1
nonmetal
earth metal
Chlorine
Cl
halogen