Strontium-90 is a radioactive isotope which is particularly hazardous. Which of the following statements is true about an atom of strontium-90?
A) It contains 38 neutrons.
B) It contains 38 protons.
C) It contains 90 protons.
D) It contains 90 protons.
B
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Using Figure 9.9 in your textbook, which element is present in the mantle in the same quantity as it is present in meteorites?
A) Ge B) Ga C) Al D) Ru
Which of the following is true of the alcohol functional groups in 1,3-propanediol?
A) One is primary and one is secondary. B) One is primary and one is tertiary. C) Both are primary. D) Neither is primary.
The Monroe Doctrine and its Roosevelt Corollary were designed to justify US activities and interventions in Latin America. What are some of the historical and modern-day interests of the United States in this region?
When Earth is closest to the Sun, its location is referred to as the ________ position
Fill in the blank(s) with correct word