Which of the following is the proper scientific notation for the number 18,200?

18,200 is expressed in scientific notation as

Explanation:

To write 18,200 using the scientific notation you have to divide it and multiply it by 10,000 (because 10,000 has 5 digits like 18,200) as follows:

10,000 can be rewritten as . Therefore:

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

po-215 i got it right on the quiz