23. An examination of the nature of elements in the periodic table reveals a. mo

Question

23. An examination of the nature of elements in the periodic table reveals a. most elements are solids at room temperature b. most elements are not naturally radioactive c. most elements are metals d. all the above are true elements would behave chemically similar to Ca c. Cl 24. Which of the following a. Na b. S d. Mg 25. Which best describes how metals and non-metals differ a. metals generally have low melting points b. metals prefer to gain electrons c. metals do not exist as diatomic molecules d. non-metals prefer to lose electrons 26. Which of the following statements is false a. all UV radiation is absorbed by the ozone layer b. UV radiation can damage cellular DNA c. Skin sensitivity is a factor in sunburning d. Using a sunscreen with an SPF factor of 35 offers more protection than one with a SPF of 15 27. Going down a group in the periodic table, the size of the atoms will a. vary irregularly b. decrease c. increase d. remain constant

Explanation / Answer

23. D..All of the statements are true.

24.D. Mg will behave similarly to Ca as they are in the same group in the periodic table

25. C. Metals do not exist as diatomic molecules.

26. A. Ozone absorbs most of the UV rays not all of them.

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