# Problem: What are the numbers of electrons, sequentially, in each of the following ions?    Ca2+, Fe2+, I-, O2-       a) 20e-, 26e-, 53e-, 8e-b) 18e-, 26e-, 54e-, 8e-c) 22e-, 28e-, 52e-, 6e-d) 18e-, 24e-, 54e-, 10e-e) 20e-, 20e-, 53e-, 8e-

###### FREE Expert Solution

We’re being asked to determine number of electrons in the ions given.  Recall that the symbol for an element or ion is as follows:

• The atomic number tells us the number of protons
• Recall that in a neutral element the number of protons and electrons are equal
• So we have to find the atomic number of each from the periodic table.
• But here we have ions so we have to modify it.
• Every (+) charge removes 1 electron.
• Every (-) charge adds 1 electron.
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###### Problem Details

What are the numbers of electrons, sequentially, in each of the following ions?

Ca2+, Fe2+, I-, O2-

a) 20e-, 26e-, 53e-, 8e-

b) 18e-, 26e-, 54e-, 8e-

c) 22e-, 28e-, 52e-, 6e-

d) 18e-, 24e-, 54e-, 10e-

e) 20e-, 20e-, 53e-, 8e-