20. The value of A f or an atom containing 12 protons, 12 electrons a. 24 b. 4 c

Question

20. The value of A f or an atom containing 12 protons, 12 electrons a. 24 b. 4 c. 28 d. 12 e. 16 21. Which group of elements contains only non-metals? a. C, Si,F b. O, Br, Xe c. Al, Se, Br d. Zn, I, Kr e. Lu, Kr, Ne 22. What is the electron configuration for silicon? C. 23. Which of the following is TRUE of a proton? a. weighs approximately 1 amu and carries a positive charge b. weighs approximately 1 amu and carries a negative charge c. weighs approximately 1 amu and is neutral (no charge) d. weighs significantly less than 1 amu and carries a negative charge e. weighs significantly less than 1 amu and carries a positive charge 24. The total number of valence electrons in an atom of tellurium (Te) is a. b. 4 c. 16 d. 52 e. 2

Explanation / Answer

21. answer: b

22. answer: c (Si = 14 , [Ne]3s2 3p2)

23. answer: a

24. answer: c , (Te - electronic configuration = [Kr] 4d10 5s2 5p4)

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