Answer:
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Explanation:
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Answer:
Explanation:3.2 ft 2 fti2 ft 4 ft ft2
The nonmetal elements have a negative charge.
Answer:
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Explanation:
Amount of Niobium-91 initially
= 300/91 =3.2967mol
2040 years = 3 ×680 = 3 half-lives
therefore, amount left = 0.4121mol
mass of Niobium-91 remaining = 0.4121 ×91 =37.5g