use the above partial periodic table to answer questions 76-79.
76. what is the number of valence electrons for ca?
a. 1 b. 2 c. 3 d. 4
77. what is the number of valence electrons for n?
a. 4 b. 5 c. 6 d. 7
78. what is the number of valence electrons for al?
a. 3 b. 4 c. 5 d. 6
79. what is the number of valence electrons for cl?
a. 4 b. 5 c. 6 d. 7
80. what is the correct electron configuration for nitrogen (atomic number = 7)?
a. 1s²2s²2p¹ b. 1s²2s²2p³ c. 1s²2s²2p⁴ d. 1s²2s²2p⁵
for the element family shown schematically below to the right of the questions,
the thermal conductivity increases as one goes down the family. order the following three elements
such that the correct thermal conductivity trend is obtained:
element a (t.c. = 0.205 w/m·k); element b (t.c. = 0.0265 w/m·k); element c (t.c. = 0.52 w/m·k)
81. in which of the three positions does element a belong?
a. top b. middle c. bottom
82. in which of the three positions does element b belong?
a. top b. middle c. bottom
in which of the three positions does element c belong?
a. top b. middle c. bottom

Question

use the above partial periodic table to answer questions 76-79.
76. what is the number of valence electrons for ca?
a. 1  b. 2  c. 3  d. 4
77. what is the number of valence electrons for n?
a. 4  b. 5  c. 6  d. 7
78. what is the number of valence electrons for al?
a. 3  b. 4  c. 5  d. 6
79. what is the number of valence electrons for cl?
a. 4  b. 5  c. 6  d. 7
80. what is the correct electron configuration for nitrogen (atomic number = 7)?
a. 1s²2s²2p¹  b. 1s²2s²2p³  c. 1s²2s²2p⁴  d. 1s²2s²2p⁵
for the element family shown schematically below to the right of the questions,
the thermal conductivity increases as one goes down the family. order the following three elements
such that the correct thermal conductivity trend is obtained:
element a (t.c. = 0.205 w/m·k); element b (t.c. = 0.0265 w/m·k); element c (t.c. = 0.52 w/m·k)
81. in which of the three positions does element a belong?
a. top  b. middle  c. bottom
82. in which of the three positions does element b belong?
a. top  b. middle  c. bottom
in which of the three positions does element c belong?
a. top  b. middle  c. bottom

Accepted Answer

### Question 76:
# Brief Explanations:
Ca is in group 2 of the periodic table. Elements in group 2 have 2 valence electrons.
# Answer:
B. 2

### Question 77:
# Brief Explanations:
N is in group 15 (or 5A) of the periodic table. Group 15 elements have 5 valence electrons.
# Answer:
B. 5

### Question 78:
# Brief Explanations:
Al is in group 13 (or 3A) of the periodic table. Group 13 elements have 3 valence electrons.
# Answer:
A. 3

### Question 79:
# Brief Explanations:
Cl is in group 17 (or 7A) of the periodic table. Group 17 elements have 7 valence electrons.
# Answer:
D. 7

### Question 80:
# Brief Explanations:
Nitrogen has an atomic number of 7, so its electron configuration is $1s^2 2s^2 2p^3$ (since $2 + 2+ 3=7$).
# Answer:
B. $1s^2 2s^2 2p^3$

### Question 81:
# Brief Explanations:
The thermal conductivity increases down the family. Element A has $k = 0.205$ W/m·K, Element B has $k = 0.0265$ W/m·K, Element C has $k = 0.52$ W/m·K. Order from lowest to highest: B ($0.0265$) < A ($0.205$) < C ($0.52$). So A is in the middle.
# Answer:
B. middle

### Question 82:
# Brief Explanations:
As thermal conductivity increases down the family, the lowest $k$ (0.0265) is at the top. So B is at the top.
# Answer:
A. top

### Question (last one, about Element C):
# Brief Explanations:
Element C has the highest $k$ (0.52), so it should be at the bottom as thermal conductivity increases down the family.
# Answer:
C. bottom

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QUESTION IMAGE

Question

Explanation:

Question 76:

Answer:

Question 77: