What is the position of an element in the periodic table if its electron configuration is 1s2 2s2 2p6 3s2 3p5
2 answers:
Answer : The position of an element in the periodic table is, Group 17 and Period 3
Explanation :
The given electronic configuration is,
Total number of electrons = 17
Number of valence electrons = 2 + 5 = 7
In the given configuration, 3 is the highest principle quantum number. Therefore, it belongs to the 3rd period in the periodic table.
If the elements belongs to the p-block then we have to determine the group number by,
Group number = Number of valence electrons + 10
Group number = 7 + 10 = 17
Hence, the position of an element in the periodic table is, Group 17 and Period 3
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Answer:
36°C
Explanation:
Given parameters:
Mass of aluminum = 725g
Quantity of heat = 2.35 x 10⁴J
Unknown:
Temperature change = ?
Solution:
To solve this problem, we simply use the expression below:
The quantity of energy is given as:
Q = m C Δt
Q is the quantity of energy
m is the mass
C is the specific heat capacity of aluminum = 0.9J/g°C
Δt is the change in temperature
The unknown is Δt;
Δt = =
= 36°C