2. For each of the following quantum numbers, give the atomic orbital designatio
ID: 912082 • Letter: 2
Question
2. For each of the following quantum numbers, give the atomic orbital designation.
n
l
ml
ms
2
0
0
-½
3
1
-1
+½
4
2
0
-½
a. 2p, 3s, 4d
b. 2p, 4p, 4f
c. 2s, 3d, 4p
d. 2s, 4p, 4s
e. 2s, 3p, 4d
3. Which of the following is a possible electron configuration?
1s22s32p6
1s22s12p7
1s22s22p63s23p83d7
1s22s22p63s23d12
1s22s22p63s23p64s13d9
10. The attraction of the nucleus on the outermost electrons in an atom tends to:
a. decrease moving from left to right and top to bottom on the periodic table.
b. decrease moving from right to left and top to bottom on the periodic table.
c. decrease moving from left to right and bottom to top on the periodic table.
d. decrease moving from right to left and bottom to top on the periodic table.
e. none of these; has no pattern
5. Very large nuclei tend to be unstable because of the:
a.
repulsive forces between neutrons.
b.
repulsive forces between protons.
c.
attraction of protons for neutrons.
d.
attraction of electrons for the positively charged nucleus.
e.
repulsive forces between electrons.
6. Fact: 24Na is unstable and radioactive. Is its n/p ratio too high or too low? In that case, which process could lead to stability?
a. Its n/p ratio is too high. It could attain stability by positron emission.
b. Its n/p ratio is too high. It could attain stability by electron capture or positron emission.
c. Its n/p ratio is too high. It could attain stability by beta emission.
d. Its n/p ratio is too low. It could attain stability by electron capture only.
e. Its n/p ratio is too low. It could attain stability by beta emission.
7. What is the mass of an alpha particle?
a. 4 amu
b. 3 amu
c. 2 amu
d. 1 amu
e. 0 amu
8. For most common types of radioactive decay, the order of least penetrating to most penetrating for human tissue is:
a. beta, gamma, alpha
b. gamma, alpha, beta
c. alpha, beta, gamma
d. gamma, alpha, beta
e. gamma, beta, alpha
9. The following reaction is an example of __________.
41Ca 41K + unknown particle
The unknown particle is _______________.
a.
positron emission; +1b
b.
electron capture; +1b
c.
alpha decay; 4He
d.
beta decay; -1b
e.
gamma emission; g
10. Complete the equation by writing the symbol of the missing particle.
211Pb -1b + unknown particle
a.
210Pb
b.
211Pb
c.
211Tl
d.
211Bi
e.
None of these.
14. Plutonium-242 is radioactive and unstable. Which reaction correctly represents the decay of this isotope?
a. 242Pu 1n + 238U
b. 242Pu + 4He 246Cm
c. 242Pu 4He + 238U
d. 242Pu 4He + 236U
e. 242Pu + -1b 242Np
15. Complete the nuclear equation
177Ta + electron capture by writing the symbol of the missing particle.
a.
177Hf
b.
177W
c.
178Ta
d.
178W
e.
178Hf
16. Complete the nuclear equation 235U + 14N -----> ______ + 5 1n by writing the isotope name for the missing particle.
a.
Pu-249
b.
At-221
c.
At-216
d.
Es-244
e.
Es-249
17. Praseodymium-135 is produced by positron emission from what isotope?
a. Pr-136
b. Nd-135
c. Praseodymium-135 is stable.
d. Ce-135
e. Pr-134
n
l
ml
ms
2
0
0
-½
3
1
-1
+½
4
2
0
-½
Explanation / Answer
Question 2: Answer e
2s 3p 4d
Question 3. Only the following is possible
1s22s22p63s23p64s13d9 .
Each orbital can occupy maximum of two electrons only.
Question 10. Answer b
decrease moving from right to left and top to bottom on the periodic table.
Question 5: Answer b
repulsive forces between protons.
Question 7: Answer a
4 amu
Alpha particle consist of two proton (2 amu) and two neutron (2amu)
Question 8: Answer e
gamma, beta, alpha
The bigger the particle, the more likely it is to have a collision with the atoms of the material. Alpha particles are the biggest and are least able to penetrate a material.
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