Problem: Fill in the blanks to complete the following table.SymbolIon FormedNumber of Electrons in IonNumber of Protons in IonCaCa2+_______________Be2+2_____Se__________34Mg__________12Complete the fourth column of the table.

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We’re being asked to complete the fourth column of the given table.


Recall that the symbol for an element or ion is as follows:




Recall that the number of protons is equal to the atomic number.


For the first row:


From the periodic table, we can see that the atomic number of calcium (Ca) is 20:

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Problem Details
Fill in the blanks to complete the following table.


SymbolIon FormedNumber of Electrons in IonNumber of Protons in Ion
CaCa2+__________
_____Be2+2_____
Se__________34
Mg__________12


Complete the fourth column of the table.

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What scientific concept do you need to know in order to solve this problem?

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