Grade 8 Science

Unit: 03 Lesson: 01

©2011, TESCCC 02/15/11 page 1 of 1

Interpreting the Periodic Table KEY

Examine the hypothetical periodic table shown below. Use this periodic table to answer the questions that follow.

K

J

F

D R

1. Which pair of elements has the same number of valence electrons?

K and F _____________________________________________________________

2. Which pair of elements is in the same period? D and R _____________________________________________________________

3. Which pair of elements is in the same group? K and F _____________________________________________________________

4. Which element has the smallest atomic number? K _____________________________________________________________

5. Which element(s) would be classified as a metal? K, F, D, and R _____________________________________________________________

6. If the atomic number of Element D is 20, what is the atomic number of Element R? 23 _____________________________________________________________

Grade 8 Science

Unit: 03 Lesson: 01

©2011, TESCCC 02/15/11 page 1 of 1

Valence Clues KEY

The diagrams below represent various atoms in which only the valence electrons are shown. Use the diagrams to provide the missing information.

Element

Number of Valence

Electrons

Metal, Nonmetal, Metalloid, Noble

Gas Group Number Period Number

1.

Sodium 1 Metal 1 3

2.

Magnesium 2 Metal 2 3

3.

Aluminum 3 Metal 13 3

4.

Silicon 4 Metalloid 14 3

5.

Phosphorous 5 Nonmetal 15 3

6.

Sulfur 6 Nonmetal 16 3

Grade 8 Science

Unit: 03 Lesson: 01

©2011, TESCCC 06/10/11 page 1 of 1

Element Code

Each numbered exercise contains element clues that will help you fill in the blanks and learn the identity of the missing word. Use the symbol for the element in each blank space.

#1 Clues Element’s Name

a. Transition metal 24 chromium

b. A common Halogen iodine

c. Family 13 bears this name boron

#2 Clues Element’s Name

a. An active alkaline earth metal with 56 protons barium

b. The alkali metal of period 3 sodium

c. The metal element that makes up table salt sodium

#3 Clues Element’s Name

a. The first of the alkali metals lithium

b. The first element of family 16 oxygen

c. A period 2 nonmetal with 5 valence electrons nitrogen

#4 Clues Element’s Name

a. Element with atomic number 31 gallium

b. The last of the alkaline earth metals radium

c. Mendeleev predicted the existence of this metalloid germanium

#5 Clues Element’s Name

a. The first element in the actinide series actinium

b. period 2 nonmetal with 6 valence electrons oxygen

c. The last of the noble gases radon

#6 Clues Element’s Name

a. A transition metal used in incandescent light bulbs tungsten

b. Period 4, Group 15 element arsenic

c. The second element in Group 15 phosphorus

d. Period 3 element with 6 valence electrons sulfur

Cr I B

A baby’s bed

Ba Na Na

A delicious yellow fruit

Li O N

The king of the jungle

Ga Ra Ge

A place to park the car

Ac O Rn

A squirrel’s treat

W As P S

Watch out for a nest of these!