Sabtu, 01 Agustus 2009

ATOMIC STRUCTURE QUIZ FOR Class XI

1. The correct information about energy is ....
a. E = nhv
b. v = Planck's constant
c. h = 6,26x10-24Jxs
d. Planck's constant = 10-34Jxs
e. if temperature increases, h doesn’t change
2. The following statements are correct, except ....
a. quantum is a small packet of energy
b. not all quanta are the same
c. photons are packets of light energy
d. Einstein : E = mc2
e. Ephoton = c/
3. De Broglie's equation is = h/mv, where ....
a. m = mass (in kg)
b. v = velocity in m/s
c. h = Planck’s constant
d.  = waves’ length
e.  = h/E because E = mv
4. Azimuthal, or subsidiary quantum number ….
a. can only have 2 possible values
b. the symbol of this quantum number is m
c. designates spatial orientation or orbitals
d. indicates the shape of the region in space an electron occupies
e. the greater this number, the farther the electrons are from the nucleus
5. How many electrons are in the outermost principal energy level of an atom of carbon in the ground state?
a. 2
b. 3
c. 4
d. 6
e. 8
6. What is the most probable location of an electron?
a. an orbital
b. a nucleus
c. a sublevel
d. an outershell
e. a principal energy level
7. In general, atoms of transition elements in Period 5 are characterized by an incomplete ….
a. 3p subshell
b. 3d subshell
c. 3f subshell
d. 4p subshell
e. 4d subshell
8. An atom has the following set of quantum numbers for its outermost electron: n = 4 l = 0 ml = 0 ms = +1/2. The atomic number of this atom is ….
a. 19
b. 20
c. 25
d. 29
e. 30
9. Which of the following statements is correct for an electron that has the quantum numbers n = 5 and ml = -4?
a. the electron is in the fourth principal shell
b. the electron may be in a f orbital
c. the electron must have a spin quantum number ms = - ½
d. none of the above applies to this electron
e. the electron may be in a p orbital
10. The set of quantum numbers, n = 2, l = 2, ml = 0
a. describes an electron in a 2p orbital
b. describes one of five orbitals of a similar type
c. describes an electron in a 2d orbital
d. is not allowed
11. The set of quantum numbers, n = 3, l = 2, ml = 0
a. is not allowed
b. describes one of five orbitals of a similar type
c. describes an electron in a 2d orbital
d. describes an electron in a 3p orbital
12. The ml quantum number for an electron in the 5s orbital ….
a. none of these is correct
b. is zero
c. may be + ½ or - ½
d. can have any integer value from 0 to 5
e. may be any integer from -5 and +5
13. Consider the sulfur atom (atomic number 16). For how many electrons does this atom have l = 1?
a. 2 d. 10
b. 6 e. 12
c. 8
14. Consider the argon atom. For how many electrons does this atom have n = 3 and l = 1?
a. 2 d. 8
b. 4 e. 10
c. 6
15. The electron configuration which represents an atom in the excited state is ….
a. 1s22s22p63s2
b. 1s22s22p63s1
c. 1s22s22p5
d. 1s22s22p6
e. 1s22s22p53s2
16. The total number of orbitals in an atom of an element with an atomic number of 18 and a mass number of 40 is ….
a. 8
b. 10
c. 18
d. 22
e. 40
17. An element which has atoms in the ground state with a sublevel that is only half filled is ….
a. helium
b. beryllium
c. nitrogen
d. neon
e. oxygen
18. What is the total number of unpaired electrons in an atom of oxygen in the ground state?
a. 1 d. 6
b. 2 e. 8
c. 4
19. Which of the following sublevels has the highest energy level?
a. 1s
b. 2p
c. 2s
d. 3p
e. 3s
20. Identify the subshell in which electrons with the quantum numbers n = 5, l = 2 may be found.
a. 6p d. 5p
b. 6f e. 6d
c. 5d
21. What type of orbital is occupied by an electron with the quantum numbers n = 4, l = 1. How many orbitals of this type are found in a multielectron atom?
a. 4p, 3 d. 4s, 2
b. 4p, 6 e. 4d, 5
c. 4s, 1
22. Give the corresponding atomic orbital designations for electrons with the following quantumn numbers.
n l ml ms .
1) 2 1 0 -1/2
2) 5 3 -1 -1/2
3) 3 2 +1 -1/2
a. 2p,5f,3d d. 2s,5d,3p
b. 2p,5d,3p e. 2p,5f,3p
c. 2p,5f,3f
23. Identify the subshell in which electrons with the quantum numbers n = 6, l = 1 may be found.
a. 6p
b. 3d
c. 5p
d. 6f
e. 6d
24. What type of orbital is occupied by an electron with the quantum numbers n = 3, l = 2. How many orbitals of this type are found in a multielectron atom?
a. 3d, 5
b. 3p, 3
c. 2p, 3
d. 3s, 1
e. 2d, 5
25. Which of the following sets of quantum numbers is not allowed?
a. n = 2, l = l, ml = 0, ms = + ½
b. n = 2, l = 1, ml = -1, ms = - ½
c. n = 3, l = 1, ml = -2, ms = + ½
d. n = 3, l = 0, ml = 0, ms = + ½
e. n = 3, l = 2, ml = 1, ms = - ½
26. Which of the following sets of quantum numbers cannot exist in an excited hydrogen atom?
a. n = 4, l = 1, ml = -2, ms = + ½
b. n = 3, l = 2, ml = 0, ms = - ½
c. n = 3, l = 2, ml = 2, ms = + ½
d. n = 2, l = 1, ml = -1, ms = - ½
e. n = 2, l = 1, ml = 0, ms = + ½
27. Which of the following sets of quantum numbers describes the most easily removed electron in an aluminum atom in its ground state?
a. n = 3, l = 0, ml = 0, ms = +1/2
b. n = 1, l = 0, ml = 0, ms = -1/2
c. n = 2, l = 1, ml = 0, ms = -1/2
d. n = 4, l = 1, ml = 1, ms = +1/2
e. n = 3, l = 1, ml = -1, ms = -1/2
28. Which in the following list of atomic orbital designations is impossible?
7s 1p 5d 2d 4f
a. 5d & 4f d. only 1p
b. 1p & 2d e. only 4f
c. 7s & 5d
29. Which of the following statements is false?
a. The three p orbitals in a p subshell are mutually perpendicular.
b. The d orbitals in an energy level are always filled after the p orbitals in the same energy level.
c. There are five d orbitals in every energy level.
d. A set of d orbitals can have a maximum of 10 electrons.
e. There are seven f orbitals per energy level starting with the fourth energy level.
30. Select an answer which includes all of the correct statements given below.
a. There are nine f orbitals in an f subshell.
b. A p orbital can have a maximum of 6 electrons.
c. Each p orbital within a subshell consists of two lobes.
d. A set of d orbitals can hold a maximum of 10 electrons.
e. Each subshell within a shell is filled prior to filling the next shell.
31. Which of the following statements is false?
a. There are 10 d orbitals in a d subshell.
b. A set of p orbitals can have a maximum of 6 electrons.
c. The third energy level has no f orbitals.
d. The s orbital is spherical.
e. The fifth energy level has a set of f orbitals.
32. Select an answer which includes all of the correct statements about f subshells.
a. They may contain a maximum of 10 electrons.
b. It contains 7 orbitals.
c. They are first found in the fifth shell.
d. Electrons are located in them only in excited atoms.
e. They are involved only in elements having atomic numbers greater than 90.
33. The position of electron which has quantum numbers n = 3, l = 2, m = 0, s = - ½ is in the ….
1. M shell 3. d orbital
2. px orbital 4. p
a. 1, 2, 3
b. 1, 3
c. 2, 4
d. 4
e. 1, 2, 3, 4
34. Atomic number of Ca = 20, Cu = 29, K = 19, To = 22 and Zn = 30. The following ions which has unpair electrons is ….
a. Ca2+
b. Ti4+
c. Cu2+
d. Zn2+
e. K+
35. Atomic number of titan is 22. The number of unpair electrons in Ti3+ is ….
a. 0 d. 3
b. 1 e. 4
c. 2

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