Textbook Question
For each element, indicate the number of valence electrons, core electrons, and unpaired electrons in the ground state: a. nitrogen
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10. Periodic Properties of the Elements
Valence Electrons of Elements
Multiple Choice
Determine the total number of valence electrons for the chlorate ion (ClO3-).
A
26
B
24
C
30
D
28
Verified step by step guidance1
Identify the number of valence electrons for each atom in the chlorate ion (ClO3-). Chlorine (Cl) is in group 17 of the periodic table and has 7 valence electrons.
Each oxygen (O) atom is in group 16 and has 6 valence electrons. Since there are three oxygen atoms, multiply the number of valence electrons for oxygen by three: 3 * 6.
Consider the charge of the ion. The chlorate ion has a -1 charge, which means there is one additional electron to account for.
Add the valence electrons from chlorine, the total from the three oxygen atoms, and the extra electron from the charge to find the total number of valence electrons.
Sum the values: 7 (from Cl) + 18 (from 3 O atoms) + 1 (extra electron from charge) to determine the total number of valence electrons in the chlorate ion.
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