Test - Atomic Structure

Question 1

11. A neutral atom may contain 8 protons…

Answer 1

9 neutrons, 10 electrons

NB pg. 8

Question 2

18. An atom is electrically neutral because…

Answer 2

The #s of p+ and e- are equal

NB pg. 7

Question 3

22. The measurement of how much matter an object contains is its…

Answer 3

Mass

NB pg. 7

Question 4

23. Which of the following elements would be the most reactive?
    Si, Ag, Ar, I

Answer 4

I

NB pg. 13

Question 5

26. An unstable nucleus results from too many or too few _____

Answer 5

Neutrons

NB pg. 7

Question 6

27. The farther an electron is from the nucleus, the more ____ it has

Answer 6

Energy

NB pg.

Question 7

29. Which particles determine the atomic # of an element?

Answer 7

Protons only

NB pg. 7

Question 8

30. The atomic # of Mg is 12. Therefore it’s nucleus must contain…

Answer 8

12 protons and and no electrons

NB pg. 7

Question 9

31. When looking at the halogens on the periodic table, how does the number of valence electrons change as the energy level is increased?

Answer 9

The total # of valence electrons does not change. It remains at 7
NB pg. 13

Question 10

32. B, C, N, and O are all members of the same_____

Answer 10

Period

NB pg. 13

Question 11

37. Electrons travel in fixed orbits around the nucleus of the atom.

Answer 11

Niels Bohr

NB pg. 4

Question 12

38. Solid Sphere Model; elements are atoms w/ different masses

Answer 12

Dalton

NB pg. 3

Question 13

39. Electron Cloud Model surrounding the nucleus is an electron cloud made of shells - electrons do not, however, travel in fixed orbits.

Answer 13

Shrodinger and Heisenberg

NB pg. 4

Question 14

45. Calcium - 42

Answer 14

n0

NB pg. 7

Question 15

46. 10Be

Answer 15

p+, n0

NB pg. 7

Question 16

47. A) this element is in the same family as Br, but has fewer protons than Mg. It must be__
    B) this element has 6 energy levels and 8 valence electrons. It must be__
    C) this element is in the alkaline earth metals group and has 3 energy levels. It must be _
    D) this element is in the family w/ the most reactive non metals and has 4 energy levels. It must be__

Answer 16

A) F B) Rn C) Mg D) Br

NB pg. 14

Question 17

49. List three elements from the group containing the most reactive non metals.

Answer 17

F, CL, Br, I, At

NB pg. 13

Question 18

50. In each period, how does the # of electrons in each kind of atom change from left to right between groups 1 and 2? Explain.

Answer 18

# of e- increases by 1 in a period as moves across the period.
NB pg. 13

Question 19

51. Property of non metals?

Answer 19

Poor conductor

NB pg. 14

Question 20

52. a) write this isotope’s notation in Nuclear form.

b) write this isotopes notation in hyphen form.

Answer 20

a) 13C b) Carbon - 13

Question 21

54. Describe one similarity and one difference between the two atoms you drew above. Include why each difference between and similarity is expected based on each element’s location on the periodic table.

Answer 21

Same = # of valence e- = group diff = # of energy levels (4vs2)
NB pg. 8