Multiple Choice
Which of the following elements is classified as an inner transition element?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which element on the periodic table has 4 energy levels and 8 valence electrons?
A
Ar (Argon)
B
Ca (Calcium)
C
Br (Bromine)
D
Kr (Krypton)
Verified step by step guidance1
Understand that the number of energy levels (or electron shells) corresponds to the period (row) of the element on the periodic table. An element with 4 energy levels is in period 4.
Recognize that valence electrons are the electrons in the outermost energy level. For main group elements, the group number often indicates the number of valence electrons.
Identify the elements in period 4: for example, K (Potassium), Ca (Calcium), and others up to Kr (Krypton).
Determine which element in period 4 has 8 valence electrons. Since 8 valence electrons correspond to a full outer shell (noble gas configuration), look for the noble gas in period 4.
Conclude that Krypton (Kr) is the element in period 4 with 8 valence electrons, as it is a noble gas with a full outer shell.
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