I Need help ASAP An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 120.59 amu. What is the percent abundance of ¹²²X?

Determine the mass of fuel required for the expected energy consumption in the united states for the next ten years. energy use per person per year in the united states = 3.5 x 1011joules base calculations on current population of 310,000,000.

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

What are the first three quantum numbers for the electrons located in subshell 2s?