Fluorine has an atomic number of 9. Then n=1 energy level has two elections, and the n=2 energy level has seven electrons. Fluorine's valence is ___.

A) + 2

B) - 2

C) + 1

D) - 1

What does revolution mean?

Only problems that are observable, measurable, repeatable, and falsifiable can be proved or disproved using the scientific method.

Vertebrates that are warm blooded, give live birth to live young, and nourish their young with milk would be classified as A) amphibians. B) bird. C) mammals. D) reptile.

A specific example of a light year is used in space exploration

Which statement best compares consumers and decomposer? A. Both get their energy by feeding on other organisms B. Both get their energy by photosynthesizing C. Consumers feed on other organisms, and decomposers make their own food D.

Match each term to its scientific definition. 1.) natural world- 2.) theory- 3.) scientific method- A. everything that can be observed or explained scientifically. B. the procedure of scientific inquiry used to investigate natural phenomena. C.

The largest component of air is

Which statement is one of the three parts of a cell theory

Separation of the nail plate from the nail bed in fungal infections is called:

Can somebody describe the fertilization process for plants is