In the shell model, the second shell can hold up to _____ ...

[rachel9]

In the shell model, the second shell can hold up to _____ electrons.
 
  a. one
  b. two
  c. four
  d. six
  e. eight

Question 2

What property do greenhouse gases have that allow them to warm a planet?
 
  What will be an ideal response?

[amandanbreshears]

Answer to Question 1

e

Answer to Question 2

Greenhouse gases makes the atmosphere less transparent to infrared radiation, so infrared radiation from the warm surface is absorbed by the atmosphere and cannot escape back into space. That traps heat and makes Earth warmer.

[rachel9]

Gracias!

[xiazhe]

Thanks for the timely response, appreciate it