What are the first and second most abundant element in the universe?

What stress will shift the following equilibrium system to the left? n2(g) + 3h2(g) ⇌ 2nh3(g) adding more n2(g) adding more nh3(g) increasing the pressure of the system reducing the volume of the container

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Which best explains why an iceberg floats?