Multiple Choice
Which two elements are the most abundant in Earth's crust?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which of the following elements is located in period 4 of the periodic table?
A
Br (bromine)
B
K (potassium)
C
Mg (magnesium)
D
O (oxygen)
Verified step by step guidance1
Understand that the periodic table is arranged in periods (rows) and groups (columns). Periods correspond to the principal energy levels (shells) being filled with electrons.
Identify the period number by looking at the element's electron configuration or its position in the periodic table. Period 4 means the element's electrons fill up to the 4th principal energy level.
Check each element's atomic number and determine its period: Oxygen (O) is in period 2, Magnesium (Mg) is in period 3, Bromine (Br) is in period 4, and Potassium (K) is in period 4.
Since the question asks which element is located in period 4, focus on elements with their outermost electrons in the 4th shell. Both Bromine (Br) and Potassium (K) are in period 4.
Recognize that Potassium (K) is the first element in period 4, while Bromine (Br) is further along in the same period. The correct answer is Potassium (K) because it is explicitly in period 4.
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