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4. The atomic mass of a proton is
A. 0 atomic mass units.
B. 2 atomic mass units.
C. 1 atomic mass units.
D. -1 atomic mass units.
5. Which of the following subatomic particles are found in the nucleus of an atom?
A. Protons and electrons
B. Electrons and neutrons
C. Protons and shells
D. Neutrons and protons
6. The number of protons in an atom is called the
A. atomic number.
B. atomic weight.
C. mass number.
D. combining weight.
7. Which subatomic particle determines the identity of an atom?
8. Which subatomic particle determines the chemical activity of an atom?
9. Atoms with more than one shell are most stable when the outermost shell contains _____ electrons.
10. Different forms of the same element with different numbers of neutrons are called
11. Exactly 6.02 x 1023 atoms of any element is called 1 ____ of that element.
A. atomic mass unit
12. Over 90% of the body is composed of four elements: carbon, nitrogen, chlorine, and hydrogen.
13. The number of electrons in the outermost shell of an atom will determine the chemical activity of the
14. Phosphorus has an atomic number of 15 and a mass number of 31. How many protons, neutrons, and
electrons does an atom of the element phosphorus have?
15. Describe each of the three subatomic particles with regard to charge, weight, and location in an atom.
16. If the atomic number of an element is 9 and the mass number is 19, how many neutrons does the atom
17. If the atomic number of an element is 27 and the mass number is 60, how many neutrons does the atom
18. Low levels of radiation are commonly used to
A. sterilize dental products.
B. destroy cancer cells.
C. produce images of body parts.
D. All apply.
19. What makes an isotope radioactive?
A. It has more protons than electrons.
B. It releases energy to become stable.
C. It releases hydrogen ions into solution.
D. It breaks down into hydrogen and electrons.
20. All radioactive isotopes are very dangerous and have no practical, safe uses.
21. High levels of radiation are NOT used
A. to sterilize medical equipment.
B. to kill cancer cells.
C. as tracers to detect molecular changes.
D. to sterilize from anthrax.
22. Atoms bonded together to form a chemical unit are called
23. A molecule made of two or more different atoms bonded together is called a(n)
24. An atom or group of atoms with a charge is called a(n)
25. An ion is an atom or molecule that
A. is in a gaseous state.
B. carries an electrical charge.
C. is attracted to a north-seeking pole.
D. forms a visible glow.
26. A bond created from the attraction between positively and negatively charged ions is a(n) ______ bond.
27. A bond created from the sharing of electrons between two atoms is a(n) ______ bond.
28. Molecules form from
A. the shape of the individual atoms.
B. the attraction between electrons.
C. the sharing of electrons.
D. a drive toward solubility.
29. When two pairs of electrons are shared between two atoms a ______ bond is formed.
A. single covalent
B. double covalent
C. triple covalent
D. double ionic