Calculate the number of molecules in 1.8 moles of oxygen (o2).

1.0836×10^24 molecules of O2. You may want to check that since I'm using a phone calculator.

Explanation:

One mole of any element is equal to 6.02×10^23 which is Avogrado's number. All you have to do is multiply 1.8 moles by Avogrado's number

lithosphere and asthenosphere

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.