Elements, Atoms, Ions, And The Periodic Table Worksheet With Answers Page 11
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14CHEM 120 Homework 3. Chapter 3
1. In the modern periodic table, the elements are arranged according to increasing ________.
a. atomic masses b. number of neutrons c. atomic number d. mass number
2. How many periods are found on the periodic table?
a. 2 b. 7 c. 18 d. 32
3. Which period contains the element Cesium?
a. 2
b. 4
c. 6
d.
7
4. Where are the alkaline earth metals located on the periodic table?
a. Group 1 (IA) b. Group 2 (IIA) c. Group 13 (IIIA) d. Group 14 (IVA) e. Group 17 (VIIA)
5. Which one of the following is not a representative element
a. Na
b. As
c. Ca
d. Fe
e. Cl
6. How many orbitals are in an s sublevel? How many in a p sublevel?
a. 2;6
b. 1;1
c. 1; 3
d. 3; 5
7. Which of the following correctly gives the electron capacity of a
principal energy level in terms of the number n?
2
2
a. n b. 2n c. 2n + 2
d. n
e. 2n
7. What requirement must be met in order for two electrons to coexist in
the same orbital?
a.
they go to a s orbital
b. they go to a p orbital
c.
they must have opposite spins
d. they must have parallel spins
8. How many valence electrons are present in an atom of silicon?
a. 2
b. 3
c. 4
d. 5
e. 7
9. The electronic configuration in an atom of argon,
2
2
a. 1s
2s
2
2
6
b. 1s
2s
2p
2
2
6
2
6
c. 1s
2s
2p
3s
3p
2
2
6
2
6
2
10
6
d. 1s
2s
2p
3s
3p
4s
3d
4p
10. Common valence electron configuration of halogens
d.
e.
1
2
2
2
2
3
2
5
a. ns
b. ns
c. ns
3p
ns
np
ns
np
+
11. What is not isoelectronic with K
?
2-
-
+
2+
a. S
b. Ar
c. Cl
d. Na
e. Ca
12. Which of the following atoms has the biggest size (radius)?
a.
Na
b. Al
c. Cl
d. Rb
e. I
13. Which of the following elements has the highest ionization energy?
a. Li b. B c. O d. F e. Ne
14. Which one of the following elements has the highest electron affinity?
a. Li
b. K
c. Kr
d. O
e. Cl
15. What charge is found on a ion from Al?
a. +1
b. -2
c. +3
d. -3
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