Question: 2. What elements are most abundant in? a. The human body: b. The Earth's crust: c. The Earth's core: d. The Universe: 3. What formal

 2. What elements are most abundant in? a. The human body:

2. What elements are most abundant in? a. The human body: b. The Earth's crust: c. The Earth's core: d. The Universe: 3. What formal term is applied to the horizontal rows of the periodic table? What is the term for the vertical columns

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