Multiple Choice
Which element is the only metalloid in period 3 of the periodic table?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which element in period 4 of the periodic table has the lowest atomic mass?
A
K (potassium)
B
Ti (titanium)
C
Sc (scandium)
D
Ca (calcium)
Verified step by step guidance1
Identify the elements listed in the problem and confirm that they all belong to period 4 of the periodic table. The elements given are K (potassium), Ti (titanium), Sc (scandium), and Ca (calcium).
Recall that the atomic mass of an element is approximately the weighted average mass of its naturally occurring isotopes, and it generally increases as you move from left to right across a period in the periodic table.
Look up or recall the atomic masses of each element: Potassium (K), Calcium (Ca), Scandium (Sc), and Titanium (Ti). These values are typically found on the periodic table or in reference materials.
Compare the atomic masses of these elements to determine which one has the lowest value. Since atomic mass increases across the period, the element furthest to the left in period 4 usually has the lowest atomic mass.
Conclude that the element with the lowest atomic mass in period 4 among the given options is the one with the smallest atomic number and position on the periodic table, which is potassium (K).
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