Multiple Choice
How many core electrons and valence electrons does an aluminum (Al) atom have?
3
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does an atom of an element in group 15 of the periodic table have?
A
7
B
3
C
5
D
8
Verified step by step guidance1
Identify the group number of the element in the periodic table. Group 15 elements are also known as the nitrogen group.
Recall that the group number for main group elements corresponds to the number of valence electrons for that element. For groups 1 and 2, the valence electrons equal the group number, and for groups 13 to 18, the valence electrons equal the group number minus 10.
Since group 15 is in the p-block and corresponds to group number 15, calculate the valence electrons as 15 - 10 = 5.
Understand that valence electrons are the electrons in the outermost shell of an atom and are responsible for chemical bonding and reactivity.
Conclude that an atom of an element in group 15 has 5 valence electrons.
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