About how many times more massive is a neon atom than a helium atom?

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

Which compound contain an iron with a 3+ charge

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.