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Topic 12 HL Atomic Structure Questions

Total questions: 49

Worksheet time: 2hrs 58mins

Name
Class
Date
1.

Which represents the shape of an s atomic orbital?

a)

A

b)

B

c)

C

d)

D

2.

Which transition in the hydrogen atom emits visible light?

a)

n = 1 to n = 2

b)

n = 2 to n = 3

c)

n = 2 to n = 1

d)

n = 3 to n = 2

3.

Which shows the first ionization energies of successive elements across period 2, from left to right?

a)

A

b)

B

c)

C

d)

D

4.

What is the ground state electron configuration of an atom of chromium, Cr (Z = 24)?

a)

[Ar] 3d6

b)

[Ar] 4s23d4

c)

[Ar] 4s13d5

d)

[Ar] 4s24p4

5.

Which of the following transitions in the hydrogen atom emits the least energy?

a)

n = 2 to n = 1

b)

n = 3 to n = 1

c)

n = 4 to n = 2

d)

n = 4 to n = 3

6.

Which statements are correct for the emission spectrum of hydrogen?

I. The lines converge at higher frequencies.

II. Electron transitions to n = 2 are responsible for lines in the visible region.

III. Lines are produced when electrons move from lower to higher energy levels.

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

7.

Which are correct statements about the emission spectrum of hydrogen in the visible region?

I. The red line has a lower energy than the blue line.

II. The lines converge at longer wavelength.

III. The frequency of the blue line is greater than the frequency of the red line.

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

8.

The values for the first three successive ionization energies for two elements X and Z are given.

Which pair of elements represents X and Z?

a)

X is Li and Z is Be

b)

X is Li and Z is C

c)

X is Be and Z is Li

d)

X is Be and Z is C

9.

Which transition on the diagram corresponds to the ionization of hydrogen in the ground state?

a)

A

b)

B

c)

C

d)

D

10.

The graph shows the first ionization energies of some consecutive elements.

Which statement is correct?

a)

Y is in group 3

b)

Y is in group 10

c)

X is in group 5

d)

X is in group 18

11.

Which electron transition in the hydrogen atom emission spectrum emits radiation with the longest wavelength?

a)

n = 2 → n = 1

b)

n = 1 → n = 2

c)

n = 4 → n = 1

d)

n = 3 → n = 2

12.

The full electron configuration of an element is:1s22s22p63s23p2

To which group and period does the element belong?

a)

A

b)

B

c)

C

d)

D

13.

Which electron transition emits radiation of the longest wavelength?

a)

A

b)

B

c)

C

d)

D

14.

The graph represents the first ten ionisation energies (IE) of an element.

What is the element?

a)

O

b)

S

c)

Ne

d)

Cl

15.

Which statement explains one of the decreases in first ionization energy (I.E.) across period 3?

a)

The nuclear charge of element Al is greater than element Mg.

b)

The electron-electron repulsion is greater, for the electron with the opposite spin, in element S than in element P.

c)

A new sub-level is being filled at element S.

d)

The p orbital being filled in element Al is at a lower energy than the s orbital in element Mg.

16.

Which is correct for the line emission spectrum for hydrogen?

a)

Line M has a higher energy than line N.

b)

Line N has a lower frequency than line M.

c)

Line M has a longer wavelength than line N.

d)

Lines converge at lower energy.

17.

Which electron configuration is correct for the selenide ion, Se2−?

a)

1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p4

b)

1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p6

c)

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4

d)

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

18.

What is the condensed electron configuration of the Fe2+ ion?

a)

[Ar] 3d6

b)

[Ar] 3d44s2

c)

[Ar] 3d54s1

d)

[Ar] 3d64s2

19.

The diagram shows the first ionization energies of four consecutive elements in the periodic table. Which element is in Group 14?

a)

A

b)

B

c)

C

d)

D

20.

A period 3 element, M, forms an oxide of the type M2O. Which represents the first four successive ionization energies of M?

a)

A

b)

B

c)

C

d)

D

21.

Which statements about the chlorine free radical are correct?

I. It has 18 electrons.

II. It is an uncharged species.

III. It is formed by homolytic fission.

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

22.

What is the total number of valence electrons in CH3COO−?

a)

16

b)

22

c)

23

d)

24

23.

The first ionization energies (in kJmol−1) of five successive elements in the periodic table are:

1314, 1681, 2081, 496 and 738

What could these elements be?

a)

d-block elements

b)

The last two elements of one period and the first three elements of the next period

c)

The last three elements of one period and the first two elements of the next period

d)

The last five elements of a period

24.

Some possible electron transitions in a hydrogen atom are shown below. Which letter represents the electron transition with the highest energy in the emission spectrum?

a)

A

b)

B

c)

C

d)

D

25.

Which species have the same electron arrangements?

I. O2-, F-, Ne

II. Li+, Na+, K+

III. S2-, Ar, K+

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

26.

Which statement about the periodic table is correct?

a)

The elements with atomic numbers 8, 16 and 34 have the same number of main energy levels.

b)

The elements with atomic numbers 8, 9 and 10 have similar chemical properties.

c)

The elements with atomic numbers 20, 21 and 22 are in the same group.

d)

The elements with atomic numbers 20, 38 and 56 have the same number of electrons in their outer energy level.

27.

Which electron configurations do not follow the Hund's rule?

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

28.

Which statement correctly describes the atomic emission spectrum of hydrogen?

a)

It is a continuous spectrum converging at high frequency.

b)

It is a line spectrum converging at high frequency.

c)

It is a continuous spectrum converging at low frequency.

d)

It is a line spectrum converging at low frequency.

29.

Which equation represents the second ionization energy of potassium?

a)

K(g) → K2+(g) + 2e−

b)

K+(g) → K2+(g) + e−

c)

K(s) → K2+(g) + 2e−

d)

K+(s) → K2+(g) + e−

30.

In the emission spectrum of the hydrogen atom, which electronic transition would produce a line in the ultraviolet region of the electromagnetic spectrum?

a)

n=1 → n=3

b)

n=3 → n=1

c)

n=3 → n=2

d)

n=10 → n=2

31.

Which diagram shows a pattern similar to the emission spectrum of hydrogen?

a)

A

b)

B

c)

C

d)

D

32.

What is the abbreviated electron configuration of the telluride ion, Te2−?

a)

[Kr]5s25d105p6

b)

[Kr]5s24d105p2

c)

[Kr]5s24d105p4

d)

[Kr]5s24d105p6

33.

What is the correct electron configuration of the Cu+

ion?

a)

[Ar] 3d7 4s1

b)

[Ar] 3d7 4s2

c)

[Ar] 3d10

d)

[Ar] 3d8 4s1

34.

Which species has the electron configuration of 1s22s22p63s23p63d8?

a)

Ni

b)

Ni2+

c)

Fe

d)

Cu2+

35.

Which statement about the electromagnetic spectrum is correct?

a)

Infrared light has a shorter wavelength than ultraviolet light.

b)

Visible light has a shorter wavelength than ultraviolet light.

c)

The frequency of visible light is higher than the frequency of infrared light.

d)

The energy of infrared light is higher than the energy of visible light.

36.

What is the name of the type of spectrum consisting only of specific wavelengths?

a)

Electromagnetic

b)

Continuous

c)

Line

d)

Mass

37.

Which statements are correct for silicon?

I. Its electron arrangement is 2,8,4.

II. It has four electrons in its highest occupied energy level.

III. In the solid state, each silicon atom is covalently bonded to four other silicon atoms in a tetrahedral arrangement.

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

38.

In the electromagnetic spectrum, which will have the shortest wavelength and the greatest energy?

a)

A

b)

B

c)

C

d)

D

39.

Which statement about the electromagnetic spectrum is not correct?

a)

The wavelength of ultraviolet radiation is shorter than infrared radiation.

b)

The frequency of visible radiation is higher than the frequency of ultraviolet radiation.

c)

The energy of infrared radiation is lower than the energy of ultraviolet radiation.

d)

Wavelength is inversely proportional to frequency.

40.

Which shows the sub-levels in order of increasing energy in the fourth energy level of an atom?

a)

f < d < p < s

b)

p < d < f < s

c)

d < f < p < s

d)

s < p < d < f

41.

What is the electron configuration of vanadium?

a)

1s22s22p63s23p63d24s3

b)

1s22s22p63s23p63d34s2

c)

1s22s22p63s23p63d44s1

d)

1s22s22p63s23p63d5

42.

Values for the successive ionization energies for an unknown element are given in the table below. In which group of the periodic table would the unknown element be found?

a)

1

b)

2

c)

3

d)

4

43.

What is the electron arrangement of the Mg2+ ion?

a)

2,2

b)

2,8

c)

2,8,2

d)

2,8,8

44.

Which species have the same number of electrons?

I. S2-

II. Cl-

III. Ne

a)

I and II only

b)

I and III only

c)

II and III only

d)

I, II and III

45.

Which is correct for the following regions of the electromagnetic spectrum?

a)

A

b)

B

c)

C

d)

D

46.

Between which ionization energies of boron will there be the greatest difference?

a)

Between 1st and 2nd ionization energies

b)

Between 2nd and 3rd ionization energies

c)

Between 3rd and 4th ionization energies

d)

Between 4th and 5th ionization energies

47.

Which species possesses only two unpaired electrons?

a)

Zn

b)

Mg

c)

Ti2+

d)

Fe2+

48.

What is the order of increasing energy of the orbitals within a single energy level?

a)

d < s < f < p

b)

s < p < d < f

c)

p < s < f < d

d)

f < d < p < s

49.

What is the electron configuration of the Cr2+

ion?

a)

[Ar]3d54s1

b)

[Ar]3d34s1

c)

[Ar]3d64s1

d)

[Ar]3d44s0

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