I need help with number 4. Please show your work and explain how you got your answers.

The p sub shell can hold up to 8 electrons in an atom. true or false?

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

How are isotopes of the same chemical element alike? how are they different?