What is the total number of electrons in a cu+ ion?
(1) 28 (3) 30(2) 29 (4) 36

The number of electrons in Cu^+ ion is 28.

Explanation: Copper has atomic number of 29 which means it has 29 electrons and 29 protons.

Argon is the noble gas with 18 electrons.

When Cu lose one electron it forms as now the number of protons are greater than the number of electrons.

The configuration of becomes

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer