PLZ HELP ITS FOR A TEST What are the rows called?

What is the octet rule?

What are the columns called?

Why do atoms bond

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

You exhale co2 which is produced during cellular respiration.  co2 combines with the water in your blood's plasma to make up one half of the body's most important buffer pair, carbonic acid.  the more physical activity you engage in, the more co2 your body is producing.  you can see this by putting some of the cabbage indicator in a glass and then blowing bubbles into it through a straw.  can you see a change in the color of the indicator?

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years