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Biggest Mistakes in Chemistry: Polyatomic Ions

Biggest Mistakes in Chemistry: Polyatomic Ions
here's a really tricky topic teachers and professors love to ask quest

ions

about this and you often see it show up on tests like the AP the SAT - and the MCAT so here's the sort of question you might see what kinds of bonds are in nano3 ionic or covalent think about this for a second now a lot of people say ionic bonds but the correct answer is actually both both ionic and covalent bonds are an nano3 let's talk about this so if you're thinking I on ik you may have been reasoning
biggest mistakes in chemistry polyatomic ions
that sodium na can form one plus ion and you may have recognized no.3 from the list of

polyatomic

ions

it's a

polyatomic

ion known as nitrate and it has a charge of 1 - and so the NA plus and the no.3 1 - because I have opposite charges will stick together just like magnets because of ionic bonds so you're totally right that nano3 does have ionic bonds they hold the NA plus together with no.3 - to understand where the covalent bonds come in we've got to talk a little bit about this
no.3 so let's zoom in on this so we can see the actual atoms here's a ni plus and now here is nitrate nitrate cEPAL a atomic ion which means that it has a whole bunch of atoms stuck together in a clump and then this whole clump has a negative charge so here's the thing as we've said ionic bonds hold these guys together but what holds the atoms together in the nitrate clump that is covalent bonds so for example there's a covalent bond between this oh and the end here holding
biggest mistakes in chemistry polyatomic ions
them together there's also a covalent bond here and a covalent bond here we can really show this if we look at Lewis structures so here's na plus now here is a lewis structure for nitrate no3 the lines between atoms show that they're sharing electrons and they're connected because of covalent bonds so there's a covalent bond here here and here holding together the atoms in nitrate and then there is an ionic bond between all of nitrate that has this negative charge and na+ so
what kinds of bonds are in nano3 ionic bonds holding the two

ions

together but then covalent bonds holding together all of the atoms that make up this

polyatomic

ion you