Multiple Choice
In the development of atomic theory, who hypothesized that atoms are tiny, hard, indivisible spheres?
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4. Atoms and Elements
Atomic Theory
Multiple Choice
Dalton used the lightest element as his standard for atomic mass. What is this element?
A
Helium
B
Oxygen
C
Carbon
D
Hydrogen
E
Nitrogen
Verified step by step guidance1
Understand the historical context: John Dalton, an English chemist, developed the atomic theory in the early 19th century. He needed a standard to compare the masses of different atoms.
Identify the lightest element: Dalton chose the lightest element known at the time as his standard for atomic mass. This element is hydrogen.
Recognize the significance of hydrogen: Hydrogen is the simplest and lightest element, consisting of one proton and one electron, which made it a logical choice for Dalton's standard.
Consider the alternatives: While helium, oxygen, carbon, and nitrogen are common elements, they are heavier than hydrogen and were not used by Dalton as his standard.
Conclude with Dalton's choice: Dalton's use of hydrogen as the standard for atomic mass set a precedent for future atomic mass measurements, emphasizing its fundamental role in chemistry.
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