Multiple Choice
How many valence shell electrons does an atom of thallium (Tl) have?
10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does gallium (Ga) have?
A
1
B
5
C
2
D
3
Verified step by step guidance1
Identify the group number of gallium (Ga) in the periodic table. Gallium is in group 13 (or IIIA), which helps determine its valence electrons.
Recall that elements in group 13 have 3 valence electrons because the group number corresponds to the number of valence electrons for main-group elements.
Understand that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
Confirm that gallium's electron configuration ends in 4s2 3d10 4p1, where the electrons in the 4s and 4p orbitals (4s2 and 4p1) are the valence electrons.
Sum the valence electrons from the outermost shell: 2 electrons from 4s and 1 electron from 4p, giving a total of 3 valence electrons for gallium.
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