which is a polyatomic ion
A Ammonium ion
B Calcium ion
C H
D He
E Na
Answers
Answer:
An!ion is!a!small!particle!having!an!electrical!charge.!!Ions!are!either!single,
charged!atoms!(simple)ions),!or!small charged “molecules”!(polyatomic ions).!!
Examples!of!simple!ions!are Na+,!Ca+2,!ClE
,!and!SE2.!!Examples!of!polyatomic ions!are!
NH4
+ ,!CO3
!2 , and!OH! .!!Positively!charged!ions are!called!cations (pronounced!catE
eyeEons)!while!negatively!charged!ions are!called!anions (pronounced!anEeyeEons).!!
In!many!cases,!the!elements!position!on!the!periodic!table!will!help!you!determine!
the!kind!of!ion!formed!(anion!or!cation)!and!the!size!of!the!ionic!charge.
Look!at!the!periodic!table (PeriodicTable.pdf!or!the!equivalent).!!Starting!
with!boron!(atomic!number!5)!and!continuing!downwards!and!to!the!right!to!
astatine!(atomic!number!85),!there!is!a!bold!“staircase” shaped!red!line.!!Elements!to!
the!left!of!this!line!are!metals,!and!commonly!form!cations.!!Elements!to!the!right!of!
this!line!are!nonEmetals,!and!commonly!form!anions.!!Some!of!the!elements!adjacent!
to!the!line!are!called!“metalloids”,!but!this!distinction!doesn’t!help!us,!so!don’t!
concern!yourself!with!it.
Explanation: