How many protons, neutrons, and electrons are there in a neutral atom of 19/9 f?

Which item is most likely part of the safety contract

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium

What is the best describtion of the side of the moon that faces earth?