Multiple Choice
In the molecule Br2 and the ion Br-, how many pairs of valence electrons does each bromine atom possess?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Which of the following pairs of elements have the same number of valence electrons?
A
Na and K
B
O and N
C
Mg and Al
D
Cl and Ne
Verified step by step guidance1
Recall that valence electrons are the electrons in the outermost shell of an atom and determine the chemical properties of the element.
Identify the group number of each element in the periodic table, since elements in the same group have the same number of valence electrons.
For each pair, determine the group of each element: Na (Group 1), K (Group 1), O (Group 16), N (Group 15), Mg (Group 2), Al (Group 13), Cl (Group 17), Ne (Group 18).
Compare the group numbers of the elements in each pair to see if they match, indicating the same number of valence electrons.
Conclude that pairs with elements in the same group have the same number of valence electrons, such as Na and K, while others do not.
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