Textbook Question
Indium consists of two isotopes, ¹¹³₄₉In and ¹¹⁵₄₉In. If the atomic mass for indium on the periodic table is 114.8, are there more atoms of ¹¹³₄₉In or ¹¹⁵₄₉In in a sample of indium?
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4. Atoms and Elements
Atomic Mass (Simplified)
Multiple Choice
Which element has the lowest atomic mass on the periodic table?
A
Hydrogen (H)
B
Carbon (C)
C
Helium (He)
D
Lithium (Li)
Verified step by step guidance1
Understand that atomic mass refers to the average mass of atoms of an element, measured in atomic mass units (amu), and it generally increases as you move down and across the periodic table.
Recall that the periodic table is arranged in order of increasing atomic number, which usually correlates with increasing atomic mass.
Identify the atomic masses of the given elements: Hydrogen (H), Carbon (C), Helium (He), and Lithium (Li).
Compare these atomic masses to determine which element has the smallest value.
Conclude that the element with the lowest atomic mass is the one with the smallest atomic number and mass, which is Hydrogen (H).
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