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How many electrons are present in a neutral atom of lithium?
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2. Atoms & Elements
The Atom
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Stars are made mostly of which two elements?
A
Hydrogen and helium
B
Carbon and oxygen
C
Nitrogen and neon
D
Iron and silicon
Guida verificata passo dopo passo1
Understand that stars primarily consist of elements formed during the early universe and through stellar processes.
Recall that the most abundant elements in the universe, especially in stars, are hydrogen and helium due to their formation during the Big Bang.
Recognize that hydrogen is the simplest and most abundant element, serving as the primary fuel for nuclear fusion in stars.
Helium is the second most abundant element, produced both from the Big Bang and as a product of hydrogen fusion in stars.
Conclude that the two main elements making up stars are hydrogen and helium, rather than heavier elements like carbon, oxygen, nitrogen, neon, iron, or silicon.
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