Multiple Choice
How many valence electrons are present in a neutral atom of phosphorus (P)?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How is the energy level of an atom's valence electrons related to its period in the periodic table?
A
The energy level of valence electrons is unrelated to the period number.
B
The principal energy level of the valence electrons corresponds to the period number.
C
All elements in the same period have valence electrons in different energy levels.
D
The principal energy level of the valence electrons is always one less than the period number.
Verified step by step guidance1
Understand that the periodic table is arranged in periods (rows) and groups (columns), where each period corresponds to a principal energy level (also called the principal quantum number, n) of the valence electrons.
Recall that the principal energy level number (n) indicates the main energy shell where the valence electrons reside, and this number increases as you move down the periods in the periodic table.
Recognize that for elements in period 1, the valence electrons are in the first energy level (n=1); for period 2, valence electrons are in the second energy level (n=2), and so on.
Conclude that the energy level of an atom's valence electrons directly corresponds to the period number of that element in the periodic table.
Therefore, the correct relationship is: The principal energy level of the valence electrons corresponds exactly to the period number.
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