Multiple Choice
In the periodic table, what are the names given to the horizontal rows and vertical columns, respectively?
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4. Atoms and Elements
Periodic Table: Classifications
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Which element is the most abundant in the universe by mass?
A
Carbon
B
Hydrogen
C
Oxygen
D
Helium
Verified step by step guidance1
Understand that the question is asking about the element that makes up the greatest portion of the universe's mass.
Recall that the universe is primarily composed of hydrogen and helium, with hydrogen being the simplest and most abundant element formed after the Big Bang.
Recognize that hydrogen atoms are the building blocks for stars and most matter in the universe, making it the most abundant element by mass.
Note that while elements like carbon and oxygen are important for life and planets, they are much less abundant on a cosmic scale compared to hydrogen.
Conclude that hydrogen is the most abundant element in the universe by mass.
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