Ions and ionic formula *MUST LEARN* Flashcards
Define the term atom
An atom is the smallest part of an element that can exist.
Define the term ion
An ion is an atom which has lost or gained electrons.
Formula and charge of the sulfate ion
SO42-
Formula and charge of the phosphate ion
PO43-
Formula and charge of the hydroxide ion
OH-
Formula and charge of the nitrate ion
NO3-
Formula and charge of the carbonate ion
CO32-
Formula and charge of a hydrogencarbonate ion
HCO3-
How many outer electrons does a group 1 atom have, and when it forms an ion, what charge does a group 1 ion have?
A group 1 atom has one outer electron which it loses to form an ion with a 1+ charge.
How many outer electrons does a group 2 atom have, and when it forms an ion, what charge does a group 2 ion have?
A group 2 atom has two outer electrons which are lost to form an ion with a 2+ charge.
How many outer electrons does a group 3 atom have, and when it forms an ion, what charge does a group 3 ion have?
A group 3 atom has three outer electrons which are lost to form an ion with a 3+ charge.
How many outer electrons does a group 5 atom have, and when it forms an ion, what charge does a group 5 ion have?
A group 5 atom has 5 outer electrons and gains 3 more to form an ion with a 3- charge.
How many outer electrons does a group 6 atom have, and when it forms an ion, what charge does a group 6 ion have?
A group 6 atom has 6 outer electrons and gains 2 more to form an ion with a 2- charge.
How many outer electrons does a group 7 atom have, and when it forms an ion, what charge does a group 7 ion have?
A group 7 atom has 7 outer electrons and gains 1 more to form an ion with a 1- charge.
How many outer electrons does a group 0 atom have, and when it forms an ion, what charge does a group 0 ion have?
A group 0 atoms has 8 outer electrons (except helium which has 2) and don’t lose or gain electrons to form ions - they already have a stable outer shell of electrons.
Chemical formula of hydrochloric acid
HCl
Chemical formula of sulfuric acid
H2SO4
Chemical formula of nitric acid
HNO3
Name the two ions in hydrochloric acid
H+ and Cl-
Name the two ions in sulfuric acid
2 x H+ and SO42-