What is the F-B-F bond angle in BF3?

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

Which is a difference between molecular compounds and ionic compounds? select the correct answer below: question 5 options: molecular compounds typically form between a metal and a nonmetal, while ionic compounds typically form between nonmetals. molecular compounds result from the transfer of electrons between atoms to form ions, while ionic compounds result from the sharing of electrons between neutral atoms. molecular compounds are formed of discrete, neutral molecules, while ionic compounds are formed of large repeating arrays of opposite charges. molecular compounds have high melting points and high boiling points, while ionic

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )