Which of these elements has chemical properties most similar to oxygen?

On the periodic table, the elements in each column, or group have....

Which of the following elements has the largest atomic number within two energy levels?

In which group would you find the least reactive elements?

Which of the following compounds contains a total of 5 atoms?

A subscript in a chemical formula tells you....

How many Hydrongen (H) atoms are in water (H2O)?

A student observes some sugar as it is heated and burns. Which of the following observations would lead to the conclusion that a chemical reaction has taken place?

An American Starburst firework gives off red, white, and blue light. How did the fireworks manufacturer get the firework to produce three different colors of light?

The green color in an unripe banana comes from chlorophyll. As the banana ripens, the chlorophyll breaks down and reveals a yellow color. What evidence suggests a chemical reaction has occurred?

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