Biochemistry Fill in for A&P - A&P I Chapter 2...

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A&P I Chapter 2 Worksheet p 1/10 Name:________________________________________ A. 18 B. 2 C. 8 D. Atomic E. atoms F. average G. carbon H. Chemistry I. Elements J. hydrogen K. ion L. isotopes M. Mass N. mass number O. Matter P. nitrogen Q. Oxygen R. Protons S. radioactive isotopes T. Weight Chapter 2 1. ___________ is the science of the structure and interactions of matter. 2. ___________ is anything that occupies space and has mass. 3. ___________ is the amount of matter a substance contains; ____________ is the force of gravity acting on a mass. 4. substances that cannot be split into simpler substances by ordinary chemical means. 5. These 4 elements, together with calcium (Ca) and phosphorus (P) make up 98.5% of total body weight. ________________ ________________ ________________ ________________ 6. Units of matter of all chemical elements are called _________ . 7. a nucleus, contains positively charged ____________, 8. neutral (uncharged) _______________, and 9. negatively charged ___________________ move about the nucleus in energy levels 10. The first shell, the one nearest the nucleus, can hold a maximum of ____electrons 11. the second shell, _____; 12. the third shell;_____, 13. The number of electrons in an atom of a neutral element always equals the number of protons. 14. The number of protons in the nucleus of an atom is the __________ number 15. the number of _______________ defines the element. 16. The _______________of an atom is the number of protons plus the number of neutrons. 17. Different atoms of the same element will have the same number of protons, but if they have a different numbers of neutrons they are _________________. 18. unstable isotopes whose nuclei decay to form a more stable configuration 19. The atomic mass , also called the atomic weight, of an element shown in the periodic table