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Science 8 Unit 3 Matter Name: ______________________________ Date: ______________ Period: __________ Sec. 7-1: Atoms are the Smallest Form of Elements Part 2 1. The ________________ ________________ of an element is the number of protons in the nucleus of an atom of that element. 2. Since the atomic number of carbon is 6, then a carbon atom has ____ protons in its nucleus, 3. The total number of protons and neutrons in the nucleus of an atom is called the atom’s ____________________________________________. 4. The number of protons in an atom of a particular element can vary. TRUE or FALSE 5. Every atom of a particular element has the same number of neutrons. TRUE or FALSE 6. An isotope is ___________________________________________________________________________________. 7. How is the atomic mass number different from the atomic number? ________________________________________ ______________________________________________________________________________________________ 8. What two things you need to add to find an atom’s atomic mass number? a. 9. ________________________ b. ________________________ How many protons, neutrons and electrons are in a neutral lithium atom? protons _______ neutrons _______ electrons _______ 10. How many protons, neutrons and electrons are in a neutral silver atom? protons _______ neutrons _______ electrons _______ 11. How does potassium-39 differ from potassium-41? _____________________________________________________ _______________________________________________________________________________________________ 12. State the difference between atomic mass and atomic number. ____________________________________________ _______________________________________________________________________________________________ 13. Why are atomic masses not usually whole numbers? ____________________________________________________ 14. Many atoms are neutral in charge because there are equal numbers of protons and electrons. If there are more or fewer electrons in an atom then it is called an ________________. 15. What must happen to form a positive ion? ____________________________________________________________ 16. How do we represent a positive magnesium ion with a +2 charge? _________________________ 17. What must happen to form a negative ion? ___________________________________________________________ 18. How do we represent a negative fluorine ion with a -1 charge? ____________________________ 19. All aluminum atoms have 13 protons. Aluminum atoms often lose 3 electrons to form ions. Label the ion on the right side by noting the protons and electrons that remain. Then, use the proper name representation of the symbol. symbol: ______________
