What is the atomic mass of an atom equal to 1/3 that of carbon-12?

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

Two nails have identical sizes and shapes. in one nail, 20 percent of the domains are lined up. in the other nail, 80 percent of the domains are lined up. which has stronger magnetic force? first answer gets brainliest!