Naturally Occurring Silicon Is Composed of Three Isotopes: ²⁸Si (Atomic

question 15

Multiple Choice

Naturally occurring silicon is composed of three isotopes: ²⁸Si (atomic mass 27.98) , ²⁹Si (atomic mass 28.98) , and ³⁰Si (atomic mass 29.97) . The atomic mass of the naturally occurring isotope mixture is 28.0855. The relative percentages of ²⁸Si, ²⁹Si, and ³⁰Si are

• A) 99.7, 0.1, 0.2
• B) 92.2, 4.7, 3.1
• C) 90.2, 1.3, 8.5
• D) 80.2, 10.8, 9.0
• E) 50.4, 20.5, 29.1

---

Definitions:

William Lloyd Garrison

An American abolitionist, journalist, and social reformer known for his strong stance against slavery and for the emancipation of slaves in the United States.

The Liberator

An anti-slavery newspaper founded by William Lloyd Garrison in 1831, dedicated to the abolitionist movement in the United States.

Nat Turner's Rebellion

An 1831 slave uprising in Virginia led by Nat Turner that resulted in the deaths of many people and had a profound impact on the attitudes towards slavery in the Southern United States.

Lower South

Refers specifically to the states of the deep south or those that first seceded from the Union, often focusing on their agriculture-based economy and role in the Confederacy.