Electrons and Energy Levels - Wikispaces

Name Date Class

Key Concept Builder LESSON 1

Electrons and Energy Levels

Key Concept How is an electron’s energy related to its distance from the nucleus?

Directions: Complete this concept map by choosing terms from the word bank and writing them in the correct
spaces. Some terms may be used more than once.

atoms bonds compounds electrons metalloids
metals neutrons nonmetals periodic table protons

are divided into Elements can join together to form

are composed
of individual

1. 5. 9.

and made up of by forming chemical
2. 6. 10.

and and between Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
3. 7. 11.

on the and
4. 8.

Directions: On each line, write the term from the word bank that correctly completes each sentence. Each term is
used only once.

groups left periods right

12. The horizontal rows of the periodic table are called .

13. The vertical columns of the table are called .

14. Except for the element hydrogen, all the elements on the
side of the table are metals.

15. The elements on the side of the table are nonmetals.

16 Elements and Chemical Bonds

Name Date Class

Key Concept Builder LESSON 1

Electrons and Energy Levels

Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. Key Concept How is an electron’s energy related to its distance from the nucleus?

Directions: On the line before each statement, write the letter of the correct answer.

1. Elements combine to form millions of
A. metals.
B. mixtures.
C. compounds.

2. The forces that hold atoms together in combinations are called
A. energy bonds.
B. nuclear bonds.
C. chemical bonds.

3. Every electron has a
A. neutral charge.
B. positive charge.
C. negative charge.

4. The exact positions of the electrons in an atom cannot be determined because
electrons are always
A. moving.
B. sharing.
C. changing.

5. Compared with electrons that are closer to the nucleus, those that are farther
away have
A. less energy.
B. more energy.
C. equal energy.

6. The electrons that form bonds with other atoms are the
A. midlevel electrons.
B. innermost electrons.
C. outermost electrons.

7. A neutral atom of an element has the same number of
A. protons and neutrons.
B. protons and electrons.
C. neutrons and electrons.

Elements and Chemical Bonds 17

Name Date Class

Key Concept Builder LESSON 1

Electrons and Energy Levels

Key Concept Why do atoms gain, lose, or share electrons?

1 18
1H 2 13 14 15 16 17 He
2 Li Be B C N O F Ne
3 Na Mg Al Si P S Cl Ar

Directions: This diagram shows the first 18 elements of the periodic table. Use the diagram to answer each
question on the lines provided.

1. How many valence electrons do atoms of hydrogen (H)
have?

2. How many valence electrons do atoms of sulfur (S) have?

3. How many chemical bonds can an atom of carbon (C) Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
form?

Directions: Answer each question on the lines provided.

4. What is a valence electron?

5. What can valence electrons do?

6. What does the number of valence electrons that an atom has tell you about the atom?

18 Elements and Chemical Bonds

Name Date Class

Key Concept Builder LESSON 1

Electrons and Energy Levels

Key Concept Why do atoms gain, lose, or share electrons?

Directions: Study the electron dot diagrams below. Circle the group-18 atoms. Then write the number of bonds
each atom can form with other atoms on the line above each diagram.

1. 2. 3.

H He C
hydrogen helium carbon

4. 5. Ne
neon
N
nitrogen

Directions: Answer each question on the lines provided.

6. Why are the atoms in group 18 stable?

Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. 7. What are the group-18 elements called?
8. What is the only way that an unstable atom can become stable?

Elements and Chemical Bonds 19