Question

there are some words missing from the story of the creation of the elements. for each question select the best word from the word bank. some words can be used more than once. some words will not be used at all.
a. 10 billion b. fusion c. big bang
d. hydrogen e. stars f. helium
g. iron h. 13.7 billion i. fission
j. supernova nucleosynthesis
k. big bang nucleosynthesis
l. stellar nucleosynthesis
assembling the raw materials: creating the elements
__1, helium and small amounts of lithium were created through a process called 2 just a minute or so after the 3__.
the elements __4 through 5 were created next in a process called 6. this process takes place in the center of 7 an creates elements through nuclear 8__.
elements heavier than __9 were created in a process called 10__.
over a period of about __11__ years, the three processes mentioned above created the elements that were used to form our solar system.
assignment continues on next page------------->
qs 12 - 17

Explanation:

• Question 1: Hydrogen ($d$) is one of the primary elements formed in the early universe.
• Question 2: Big - bang nucleosynthesis ($k$) is the process that formed hydrogen, helium, and small amounts of lithium.
• Question 3: The big bang ($c$) is the event after which the nucleosynthesis occurred.
• Question 4: Helium ($f$) is an element formed in the early universe processes.
• Question 5: Iron ($g$) is a key element in stellar nucleosynthesis discussions (as elements up to iron are formed in normal stellar fusion).
• Question 6: Stellar nucleosynthesis ($l$) is the process in stars for forming elements.
• Question 7: Stars ($e$) are the sites for stellar nucleosynthesis.
• Question 8: Fusion ($b$) is the nuclear process in stars for element formation (up to iron).
• Question 9: Iron ($g$) is the boundary element; elements heavier than iron are formed in supernova nucleosynthesis.
• Question 10: Supernova nucleosynthesis ($j$) forms elements heavier than iron.
• Question 11: 13.7 billion ($h$) years is the approximate age of the universe during which these element - forming processes occurred.

Answer:

1. $d$
2. $k$
3. $c$
4. $f$
5. $g$
6. $l$
7. $e$
8. $b$
9. $g$
10. $j$
11. $h$