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Name ______________________________ Class___________________Date__________________ Skills Worksheet Vocabulary and Section Summary The Atom VOCABULARY In your own words, write a definition of the following terms in the space provided. 1. proton _______________________________________________________________ _______________________________________________________________ 2. atomic mass unit _______________________________________________________________ _______________________________________________________________ 3. neutron _______________________________________________________________ _______________________________________________________________ 4. atomic number _______________________________________________________________ _______________________________________________________________ 5. isotope _______________________________________________________________ _______________________________________________________________ 6. mass number _______________________________________________________________ _______________________________________________________________ 7. atomic mass _______________________________________________________________ _______________________________________________________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 14 Introduction to Atoms Name ______________________________ Class___________________Date__________________ Vocabulary and Section Summary continued SECTION SUMMARY Read the following section summary. • Atoms are extremely small. Ordinary-sized objects are made up of very large • • • • numbers of atoms. Atoms consist of a nucleus, which has protons and usually neutrons, and electrons, located in electron clouds around the nucleus. The number of protons in the nucleus of an atom is that atom’s atomic number. All atoms of an element have the same atomic number. Different isotopes of an element have different numbers of neutrons in their nuclei. Isotopes of an element share most chemical and physical properties. The mass number of an atom is the sum of the atom’s neutrons and protons. • Atomic mass is a weighted average of the masses of natural isotopes of an element. • The forces at work in an atom are gravitational force, electromagnetic force, strong force, and weak force. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 15 Introduction to Atoms