Free Printable Ions Worksheets - Free Printable

To complete the table, we need to determine two things for each element:
1. Ionic Symbol: This tells us the charge of the ion. Metals (on the left side of the periodic table) usually lose electrons and become positive (+). Non-metals (on the right side) usually gain electrons and become negative (-). The number corresponds to their group number or how many electrons they need to reach a stable "octet" (8 valence electrons).
2. Number Of Electrons Lost Or Gained: This is simply the number associated with the charge. If it's positive, they lost electrons. If it's negative, they gained electrons.

Here is the step-by-step breakdown for each element:

* Hydrogen (H): It is in Group 1. It loses 1 electron to become stable like Helium.
* Charge: +1 $\rightarrow$ Symbol: $H^+$
* Action: Lost 1
* Calcium (Ca): It is in Group 2 (Alkaline Earth Metals). It loses 2 electrons.
* Charge: +2 $\rightarrow$ Symbol: $Ca^{2+}$
* Action: Lost 2
* Oxygen (O): It is in Group 16. It has 6 valence electrons and needs 2 more to make 8. It gains 2 electrons.
* Charge: -2 $\rightarrow$ Symbol: $O^{2-}$
* Action: Gained 2
* Bromine (Br): It is in Group 17 (Halogens). It has 7 valence electrons and needs 1 more. It gains 1 electron.
* Charge: -1 $\rightarrow$ Symbol: $Br^-$
* Action: Gained 1
* Strontium (Sr): It is in Group 2. Like Calcium, it loses 2 electrons.
* Charge: +2 $\rightarrow$ Symbol: $Sr^{2+}$
* Action: Lost 2
* Potassium (K): It is in Group 1 (Alkali Metals). It loses 1 electron.
* Charge: +1 $\rightarrow$ Symbol: $K^+$
* Action: Lost 1
* Sulfur (S): It is in Group 16. Like Oxygen, it needs 2 more electrons. It gains 2 electrons.
* Charge: -2 $\rightarrow$ Symbol: $S^{2-}$
* Action: Gained 2
* Magnesium (Mg): It is in Group 2. It loses 2 electrons.
* Charge: +2 $\rightarrow$ Symbol: $Mg^{2+}$
* Action: Lost 2
* Aluminum (Al): It is in Group 13. It has 3 valence electrons and loses all 3.
* Charge: +3 $\rightarrow$ Symbol: $Al^{3+}$
* Action: Lost 3
* Selenium (Se): It is in Group 16. Like Oxygen and Sulfur, it gains 2 electrons.
* Charge: -2 $\rightarrow$ Symbol: $Se^{2-}$
* Action: Gained 2
* Chlorine (Cl): It is in Group 17. Like Bromine, it gains 1 electron.
* Charge: -1 $\rightarrow$ Symbol: $Cl^-$
* Action: Gained 1
* Lithium (Li): It is in Group 1. It loses 1 electron.
* Charge: +1 $\rightarrow$ Symbol: $Li^+$
* Action: Lost 1
* Rubidium (Rb): It is in Group 1. It loses 1 electron.
* Charge: +1 $\rightarrow$ Symbol: $Rb^+$
* Action: Lost 1
* Fluorine (F): It is in Group 17. It gains 1 electron.
* Charge: -1 $\rightarrow$ Symbol: $F^-$
* Action: Gained 1
* Iodine (I): It is in Group 17. It gains 1 electron.
* Charge: -1 $\rightarrow$ Symbol: $I^-$
* Action: Gained 1

Final Answer:

| Name of the Element | Ionic Symbol | Number Of Electrons Lost Or Gained |
| :--- | :---: | :---: |
| Hydrogen | $H^+$ | Lost 1 |
| Calcium | $Ca^{2+}$ | Lost 2 |
| Oxygen | $O^{2-}$ | Gained 2 |
| Bromine | $Br^-$ | Gained 1 |
| Strontium | $Sr^{2+}$ | Lost 2 |
| Potassium | $K^+$ | Lost 1 |
| Sulfur | $S^{2-}$ | Gained 2 |
| Magnesium | $Mg^{2+}$ | Lost 2 |
| Aluminum | $Al^{3+}$ | Lost 3 |
| Selenium | $Se^{2-}$ | Gained 2 |
| Chlorine | $Cl^-$ | Gained 1 |
| Lithium | $Li^+$ | Lost 1 |
| Rubidium | $Rb^+$ | Lost 1 |
| Fluorine | $F^-$ | Gained 1 |
| Iodine | $I^-$ | Gained 1 |