i know ambient, atmospheric, raw, and symphonic black metal, what are other genres and what are their features and difference ?
well, first i think we need to examine the correct definition of an ionic bond. (if you are not literate in chem terminology, you may get slightly lost). first of all, all elements bond to achieve noble gas configuration (octet rule). each element has a different electronegativity level (the ability to grab electrons as a neutral atom). fluorine has the highest electronegativity because it is small (can grab easier). why not helium? because helium's nuclear charge is not very effective against other atom's electrons. so, what does this have to do with bonding? when two elements bond together, if the difference in their electronegativty is 0 - roughly 0.4, then the molecular or covalent bond is considered nonpolar (neutral). the electrons are shared evenly. if the electronegativity between two atoms bonding is about 0.5 through ehh, about 1.7, then the electrons are shared unequally, and the molecule is considered polar. when the electronegativity is greater than 1.7, the electrons are shared so unequally that more electronegative atom appears to steal the electron from the electronpositive atom. this creates what is called an ionic bond. it typically does form between metals and nonmetals, with their relative location to fluorine on the periodic table. however, ionic bonds could be between two nonmetals that have great electronegativity differences. for example, i know that boron tends to form covalent bonds with nonmetals, even though it is a metal. im sure if you googled this, you could find examples of two nonmetals ionically bonded, but i have explained why it is possible.
I think both of your guesses are right.
Metals always bond ionically because covalent bonding is between two non-metals only - you are correct in both statements. Just remember: metal + non-metal = ionic bonds eg. sodium + chlorine = sodium chloride non-metal + non-metal = covalent bonds eg. hydrogen + fluorine = hydrogen fluoride hope this helps you out =D
