Symbols, valence, and chemical equations MCQ
1. Which of the following is the chemical symbol for oxygen?
a) O
b) Oh
c) Ox
d) Os
Answer: a) O
2. How many valence electrons does an atom of chlorine have?
a) 1
b) 2
c) 7
d) 8
Answer: c) 7
3. What is the chemical symbol for sodium?
a) S
b) So
c) Sn
d) Na
Answer: d) Na
4. How many valence electrons does an atom of calcium have?
a) 2
b) 4
c) 6
d) 8
Answer: b) 2
5. Which of the following is the chemical symbol for carbon?
a) Ca
b) Cb
c) Co
d) C
Answer: d) C
6. How many valence electrons does an atom of oxygen have?
a) 2
b) 4
c) 6
d) 8
Answer: b) 4
7. What is the chemical symbol for hydrogen?
a) H
b) He
c) Hg
d) Ho
Answer: a) H
8. How many valence electrons does an atom of nitrogen have?
a) 2
b) 4
c) 6
d) 8
Answer: c) 6
9. Which of the following is the chemical symbol for gold?
a) Ag
b) Au
c) Agd
d) G
Answer: b) Au
10. How many valence electrons does an atom of chlorine have?
a) 1
b) 2
c) 7
d) 8
Answer: c) 7
11. What is the chemical symbol for iron?
a) Ir
b) In
c) Fe
d) Fn
Answer: c) Fe
12. How many valence electrons does an atom of aluminum have?
a) 2
b) 4
c) 6
d) 8
Answer: b) 3
13. Which of the following is the chemical symbol for silver?
a) Si
b) Ag
c) Al
d) Av
Answer: b) Ag
14. How many valence electrons does an atom of oxygen have?
a) 2
b) 4
c) 6
d) 8
Answer: b) 6
15. What is the chemical symbol for helium?
a) Hl
b) He
c) Hm
d) Hn
Answer: b) He
16. How many valence electrons does an atom of phosphorus have?
a) 2
b) 4
c) 6
d) 8
Answer: c) 5
17. Which of the following is the chemical symbol for potassium?
a) Pt
b) Pm
c) K
d) Ko
Answer: c) K
18. How many valence electrons does an atom of sulfur have?
a
) 2
b) 4
c) 6
d) 8
Answer: c) 6
19. What is the chemical symbol for lead?
a) Ld
b) Le
c) Pb
d) Pl
Answer: c) Pb
20. How many valence electrons does an atom of fluorine have?
a) 2
b) 4
c) 6
d) 8
Answer: a) 7
21. Which of the following is the chemical symbol for zinc?
a) Zc
b) Zn
c) Zd
d) Zk
Answer: b) Zn
22. How many valence electrons does an atom of magnesium have?
a) 2
b) 4
c) 6
d) 8
Answer: a) 2
23. What is the chemical symbol for silver?
a) S
b) Ag
c) Si
d) Sr
Answer: b) Ag
24. How many valence electrons does an atom of nitrogen have?
a) 2
b) 4
c) 6
d) 8
Answer: c) 5
25. Which of the following is the chemical symbol for mercury?
a) Hg
b) Me
c) Mr
d) Hm
Answer: a) Hg
26. How many valence electrons does an atom of silicon have?
a) 2
b) 4
c) 6
d) 8
Answer: b) 4
27. What is the chemical symbol for potassium?
a) K
b) P
c) Ko
d) Pt
Answer: a) K
28. How many valence electrons does an atom of oxygen have?
a) 2
b) 4
c) 6
d) 8
Answer: c) 6
29. Which of the following is the chemical symbol for tin?
a) Ti
b) Tn
c) Sn
d) Si
Answer: c) Sn
30. How many valence electrons does an atom of phosphorus have?
a) 2
b) 4
c) 6
d) 8
Answer: c) 5
31. What is the chemical symbol for mercury?
a) Hm
b) He
c) Hg
d) Hr
Answer: c) Hg
32. How many valence electrons does an atom of aluminum have?
a) 2
b) 4
c) 6
d) 8
Answer: b) 3
33. Which of the following is the chemical symbol for silver?
a) Ag
b) Si
c) Al
d) Ar
Answer: a) Ag
34. How many valence electrons does an atom of oxygen have?
a) 2
b) 4
c) 6
d) 8
Answer: b) 6
35. What is the chemical symbol for helium?
a) Hl
b) He
c) Hm
d) Hn
Answer: b) He
36. How many valence
electrons does an atom of phosphorus have?
a) 2
b) 4
c) 6
d) 8
Answer: c) 5
37. Which of the following is the chemical symbol for potassium?
a) Pt
b) Pm
c) K
d) Ko
Answer: c) K
38. How many valence electrons does an atom of sulfur have?
a) 2
b) 4
c) 6
d) 8
Answer: c) 6
39. What is the chemical symbol for lead?
a) Ld
b) Le
c) Pb
d) Pl
Answer: c) Pb
40. How many valence electrons does an atom of fluorine have?
a) 2
b) 4
c) 6
d) 8
Answer: a) 7
41. Which of the following is the chemical symbol for zinc?
a) Zc
b) Zn
c) Zd
d) Zk
Answer: b) Zn
42. How many valence electrons does an atom of magnesium have?
a) 2
b) 4
c) 6
d) 8
Answer: a) 2
43. What is the chemical symbol for silver?
a) S
b) Ag
c) Si
d) Sr
Answer: b) Ag
44. How many valence electrons does an atom of nitrogen have?
a) 2
b) 4
c) 6
d) 8
Answer: c) 5
45. Which of the following is the chemical symbol for mercury?
a) Hg
b) Me
c) Mr
d) Hm
Answer: a) Hg
46. How many valence electrons does an atom of silicon have?
a) 2
b) 4
c) 6
d) 8
Answer: b) 4
47. What is the chemical symbol for potassium?
a) K
b) P
c) Ko
d) Pt
Answer: a) K
48. How many valence electrons does an atom of oxygen have?
a) 2
b) 4
c) 6
d) 8
Answer: c) 6
49. Which of the following is the chemical symbol for tin?
a) Ti
b) Tn
c) Sn
d) Si
Answer: c) Sn
50. How many valence electrons does an atom of phosphorus have?
a) 2
b) 4
c) 6
d) 8
Answer: c) 5
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