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1 Skills Worksheet Directed Reading p Section: Electrons and Chemical Bonding COMBINING ATOMS THROUGH CHEMICAL BONDING Circle the letter of the best answer for each question. 1. Which of these substances is a combination of carbon, hydrogen, and oxygen? a. sugar c. water b. salt d. sulfuric acid 2. What is the joining of atoms to form new substances? a. chemical bonding b. bonding c. joining chemicals d. bonding atoms 3. What do you call an interaction that holds two atoms together? a. chemical hold b. chemical bond c. chemical connection d. bond of chemicals 4. What can be shared in chemical bonds? a. atoms c. electrons b. protons d. neutrons 5. What do we use to help us know why atoms form bonds? a. observations c. charts b. maps d. models ELECTRON NUMBER AND ORGANIZATION 6. How many valence electrons are in an oxygen atom? a. 2 c. 6 b. 4 d. 8 Holt Science and Technology 9 Chemical Bonding
2 Directed Reading B continued Outer-Level Electrons and Bonding Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence. valence electron atomic number group valence electron atomic number group 7. The number of protons in an atom is 8. On the periodic table, atoms in the same have the same number of valence electrons. 9. An electron in the outermost level of an atom is a(n) TO BOND OR NOT TO BOND Circle the letter of the best answer for each question. 10. What determines whether an atom will form bonds? a. number of electrons b. number of valence electrons c. number of protons d. number of neutrons 11. Which group on the periodic table contains elements that do not normally form chemical bonds? a. Group 2 b. Group 6 c. Group 10 d. Group 18 Holt Science and Technology 10 Chemical Bonding
3 Directed Reading B continued Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence. eight two electrons 12. Helium atoms need only valence electrons to have a filled outer energy level. 13. Atoms bond by gaining, losing, or sharing 14. Atoms of the noble gases have valence electrons and usually do not form chemical bonds. eight two magnesium helium Filling the Outermost Level 15. Atoms of form bonds by losing 2 electrons in their outermost energy level. 16. A filled outermost level in most atoms has electrons. Is Two Electrons a Full Set? 17. The first level of an atom has electrons. 18. The outermost energy level in a(n) atom is the first energy level. Holt Science and Technology 11 Chemical Bonding
4 Skills Worksheet Section Review p Electrons and Chemical Bonding USING KEY TERMS 1. Use the following terms in the same sentence: chemical bond and valence electron. UNDERSTANDING KEY IDEAS 2. Which of the following atoms do not usually form bonds? a.calcium b.neon c.hydrogen d.oxygen 3. Describe chemical bonding. 4. Explain how to use the valence electrons in an atom to predict if the atom will form bonds. CRITICAL THINKING 5. Making Inferences How can an atom that has 5 valence electrons achieve a full set of valence electrons? Holt Science and Technology 12 Chemical Bonding
5 Section Review continued 6. Applying Concepts Identify the number of valence electrons in a barium atom. INTERPRETING GRAPHICS 7. Look at the model below. How many valence electrons are in a fluorine atom? Will fluorine atoms form bonds? Explain. Holt Science and Technology 13 Chemical Bonding
Chapter 1 Section 1- Pages 4-7: Electrons and Chemical Bonding COMBINING ATOMS THROUGH CHEMICAL BONDING
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