Free Printable Ions Worksheets - Free Printable

Let's complete the Ions Formation Worksheet step by step. We'll use basic atomic structure principles:

- Atomic number = number of protons
- Atomic mass ≈ number of protons + number of neutrons
- Number of electrons = number of protons – charge (for ions)
- Ionic symbol indicates the element and its charge

We’ll fill in the missing values row by row.

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Row 1: Oxygen

Already complete:
- Element: Oxygen
- Atomic Number: 8
- Atomic Mass: 16
- Protons: 8
- Electrons: 8
- Neutrons: 10
- Ionic Symbol: O²⁻

✔ Complete.

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Row 2: Iodine

- Atomic Number: ? → From protons = 53 → So Atomic Number = 53
- Atomic Mass: ? → Protons + Neutrons = 53 + 74 = 127
- Number of Electrons: 54 → Since it has more electrons than protons, it’s an anion: charge = 53 - 54 = -1 → I⁻
- Ionic Symbol: I⁻

✔ Filled:
- Atomic Number: 53
- Atomic Mass: 127
- Ionic Symbol: I⁻

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Row 3: Hydrogen

- Atomic Number: 1
- Atomic Mass: ? → Protons + Neutrons = 1 + 0 = 1
- Protons: 1 (same as atomic number)
- Electrons: 0 → So charge = 1 - 0 = +1 → H⁺
- Neutrons: 0
- Ionic Symbol: H⁺

✔ Filled:
- Atomic Mass: 1
- Ionic Symbol: H⁺

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Row 4: Nitrogen

- Atomic Number: ? → Protons = 7 → So Atomic Number = 7
- Atomic Mass: 14
- Protons: 7
- Electrons: ? → Ionic symbol is N³⁻ → charge = -3 → electrons = 7 + 3 = 10
- Neutrons: Atomic mass - protons = 14 - 7 = 7
- Ionic Symbol: N³⁻ (given)

✔ Filled:
- Atomic Number: 7
- Number of Electrons: 10
- Number of Neutrons: 7

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Row 5: Bromine

- Atomic Number: ? → Protons = 35 → Atomic Number = 35
- Atomic Mass: ? → Protons + Neutrons = 35 + 45 = 80
- Protons: 35
- Electrons: 36 → So charge = 35 - 36 = -1 → Br⁻
- Neutrons: 45
- Ionic Symbol: Br⁻

✔ Filled:
- Atomic Number: 35
- Atomic Mass: 80
- Ionic Symbol: Br⁻

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Row 6: Element with Atomic Number 5

- Element: Atomic number 5 → Boron (B)
- Atomic Mass: 11
- Protons: 5
- Electrons: 2 → So charge = 5 - 2 = +3 → B³⁺
- Neutrons: 6
- Ionic Symbol: B³⁺

✔ Filled:
- Element: Boron
- Ionic Symbol: B³⁺

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Row 7: Element with Atomic Number 17

- Element: Atomic number 17 → Chlorine (Cl)
- Atomic Mass: ? → Protons + Neutrons = 17 + 18 = 35
- Protons: 17
- Electrons: 18 → Charge = 17 - 18 = -1 → Cl⁻
- Neutrons: 18
- Ionic Symbol: Cl⁻

✔ Filled:
- Element: Chlorine
- Atomic Mass: 35
- Ionic Symbol: Cl⁻

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Row 8: Aluminum

- Atomic Number: ? → Protons = 13 → Atomic Number = 13
- Atomic Mass: 27
- Protons: 13
- Electrons: 10 → Charge = 13 - 10 = +3 → Al³⁺
- Neutrons: Atomic mass - protons = 27 - 13 = 14
- Ionic Symbol: Al³⁺

✔ Filled:
- Atomic Number: 13
- Number of Neutrons: 14
- Ionic Symbol: Al³⁺

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Row 9: Iron (Fe²⁺)

- Element: Given as Fe²⁺ → Iron
- Atomic Number: 26
- Atomic Mass: 56
- Protons: 26
- Electrons: ? → Charge = +2 → electrons = 26 - 2 = 24
- Neutrons: 30
- Ionic Symbol: Fe²⁺ (given)

✔ Filled:
- Element: Iron
- Number of Electrons: 24

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Row 10: Copper

- Element: Copper
- Atomic Number: ? → Look at atomic mass = 64, protons = ?, electrons = 27
- But wait: we need to find atomic number from other data.
- Number of electrons = 27
- But copper commonly forms Cu⁺ or Cu²⁺. Let's find protons.
- However, we don't have protons directly. But atomic mass = 64
- Neutrons = ? → Not given
- Wait — we can deduce from known data.

Actually, Copper has atomic number 29 (standard knowledge).

So:
- Atomic Number: 29
- Protons: 29
- Electrons: 27 → so charge = 29 - 27 = +2 → Cu²⁺
- Neutrons = Atomic mass - protons = 64 - 29 = 35
- Ionic Symbol: Cu²⁺

✔ Filled:
- Atomic Number: 29
- Number of Protons: 29
- Number of Neutrons: 35
- Ionic Symbol: Cu²⁺

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✔ Final Completed Table:

| Element | Atomic Number | Atomic Mass | Number of Protons | Number of Electrons | Number of Neutrons | Ionic Symbol |
|--------------|---------------|-------------|-------------------|---------------------|--------------------|--------------|
| Oxygen | 8 | 16 | 8 | 8 | 10 | O²⁻ |
| Iodine | 53 | 127 | 53 | 54 | 74 | I⁻ |
| Hydrogen | 1 | 1 | 1 | 0 | 0 | H⁺ |
| Nitrogen | 7 | 14 | 7 | 10 | 7 | N³⁻ |
| Bromine | 35 | 80 | 35 | 36 | 45 | Br⁻ |
| Boron | 5 | 11 | 5 | 2 | 6 | B³⁺ |
| Chlorine | 17 | 35 | 17 | 18 | 18 | Cl⁻ |
| Aluminum | 13 | 27 | 13 | 10 | 14 | Al³⁺ |
| Iron | 26 | 56 | 26 | 24 | 30 | Fe²⁺ |
| Copper | 29 | 64 | 29 | 27 | 35 | Cu²⁺ |

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🔍 Explanation Summary:

- Atomic Number = number of protons (defines the element).
- Atomic Mass ≈ protons + neutrons.
- Electrons = protons − charge (for ions). For neutral atoms, electrons = protons.
- Ionic Symbol includes the element symbol and charge (e.g., O²⁻ means oxygen ion with 2 extra electrons).
- Use periodic table knowledge for unknown elements (e.g., atomic number 29 = Copper).

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