A. Write "T" if the statement is true and "F" if the statement is false. 1. Metals are good oxidizing agents. 2. Metal oxides form acids with water. 3. Active metals release hydrogen from acids. 4. Metals usually react by gaining electrons to other atoms. 5. Metals react with halides to form salts. 6. Metals react slowly with oxygen in the air, forming metal oxide. 7. Metals tend to form cations and almost have positive oxidation numbers. 8. Alkali metal reacts with water to form metal hydroxide and hydrogen gas. 9. Transition metals in their ores are colored. 10. Metals have high ionization and electron affinity.

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Group 15 elements

The elements of group 15 are phosphorus, nitrogen, bismuth antimony, and arsenic. The most abundant element which is present in the air is nitrogen and the percentage of nitrogen present in the air is 78%. In the free state, the elemental nitrogen is present as diatomic gas (N2). In the organic matter obtained from plants and animals, phosphorus is the dominant element present. In nucleic acids, phosphate groups are present. Phosphates are also found in teeth and bones. The other elements arsenic, bismuth, and antimony are found as sulfides. Arsenopyrite, bismuth glance, and stibnite are examples of sulfides of arsenic, bismuth, and antimony respectively.