Consider the total ionic equation below.
2h+ + croa
ba2+ + 20h —— ba2+ + crox + 2h20
what are the spectator ions in this equation?
o hand oh
o h and ba2+
o croz and oh-
o cro- and ba2+

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Six base units were recommended: the metre, kilogram,second, ampere, degree kelvin (later renamed kelvin), and candela. in 1960, the 11th  cgpm  named the system the international system of units, abbreviated si from the french name, le système international  d'unités.