Worksheet on Electron Arrangement Storyboard by kristen - Free Printable

Let’s go step by step to fill in the correct numbers for each element. We’ll use what we know about atoms:

- The atomic number tells us how many protons are in the atom.
- In a neutral atom, the number of electrons equals the number of protons.
- The atomic mass (rounded) is roughly the total of protons + neutrons.
- So, neutrons = atomic mass - atomic number.

We’ll look up or recall the standard values for each element (using the most common isotopes):

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Hydrogen

- Atomic Number = 1 → Protons = 1
- Electrons = 1 (same as protons in neutral atom)
- Atomic Mass ≈ 1 → Neutrons = 1 - 1 = 0

✔ Hydrogen:
Protons: 1
Neutrons: 0
Electrons: 1
Atomic Number: 1
Atomic Mass: 1

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Carbon

- Atomic Number = 6 → Protons = 6
- Electrons = 6
- Atomic Mass ≈ 12 → Neutrons = 12 - 6 = 6

✔ Carbon:
Protons: 6
Neutrons: 6
Electrons: 6
Atomic Number: 6
Atomic Mass: 12

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Oxygen

- Atomic Number = 8 → Protons = 8
- Electrons = 8
- Atomic Mass ≈ 16 → Neutrons = 16 - 8 = 8

✔ Oxygen:
Protons: 8
Neutrons: 8
Electrons: 8
Atomic Number: 8
Atomic Mass: 16

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Sulfur

- Atomic Number = 16 → Protons = 16
- Electrons = 16
- Atomic Mass ≈ 32 → Neutrons = 32 - 16 = 16

✔ Sulfur:
Protons: 16
Neutrons: 16
Electrons: 16
Atomic Number: 16
Atomic Mass: 32

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Nitrogen

- Atomic Number = 7 → Protons = 7
- Electrons = 7
- Atomic Mass ≈ 14 → Neutrons = 14 - 7 = 7

✔ Nitrogen:
Protons: 7
Neutrons: 7
Electrons: 7
Atomic Number: 7
Atomic Mass: 14

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Boron

- Atomic Number = 5 → Protons = 5
- Electrons = 5
- Atomic Mass ≈ 11 → Neutrons = 11 - 5 = 6

✔ Boron:
Protons: 5
Neutrons: 6
Electrons: 5
Atomic Number: 5
Atomic Mass: 11

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Helium

- Atomic Number = 2 → Protons = 2
- Electrons = 2
- Atomic Mass ≈ 4 → Neutrons = 4 - 2 = 2

✔ Helium:
Protons: 2
Neutrons: 2
Electrons: 2
Atomic Number: 2
Atomic Mass: 4

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Final Answer:

Hydrogen:
Protons: 1
Neutrons: 0
Electrons: 1
Atomic Number: 1
Atomic Mass: 1

Carbon:
Protons: 6
Neutrons: 6
Electrons: 6
Atomic Number: 6
Atomic Mass: 12

Oxygen:
Protons: 8
Neutrons: 8
Electrons: 8
Atomic Number: 8
Atomic Mass: 16

Sulfur:
Protons: 16
Neutrons: 16
Electrons: 16
Atomic Number: 16
Atomic Mass: 32

Nitrogen:
Protons: 7
Neutrons: 7
Electrons: 7
Atomic Number: 7
Atomic Mass: 14

Boron:
Protons: 5
Neutrons: 6
Electrons: 5
Atomic Number: 5
Atomic Mass: 11

Helium:
Protons: 2
Neutrons: 2
Electrons: 2
Atomic Number: 2
Atomic Mass: 4