A substance is made up of 78.57% boron and 21.43% hydrogen. What is the formula for this compound?

How much energy moves onto the next level, in an energy pyramid

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh