Educational worksheet on metals and non-metals for Class-VII, focusing on electron shells and ion formation.

Let’s go step by step to fill in each blank correctly, using the word bank provided at the top.

We are matching concepts about metals, non-metals, electrons, and ions — typical for Class VII science.

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Word Bank (left column | right column):

- to have 8 electrons in outermost shell → this is the definition of “octet”
- eight → number
- positive → charge type
- negative → charge type
- gain → action (for non-metals)
- 4,5,6 or 7 → number of valence electrons for non-metals
- loose or gain → possible actions (but we’ll see which fits better)
- cations → name for positive ions
- 1,2 or 3 → number of valence electrons for metals
- loose → action (for metals)

Note: “loose” here likely means “lose” — common typo in worksheets. We’ll treat it as “lose”.

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Now solve each question:

1. Noble gases have __________ electrons in the outermost shell.
→ Noble gases are stable because they have 8 electrons in their outer shell (except helium, but for Class VII, we say 8).
✔ Answer: eight

2. Metals have __________ electrons in the outermost shell.
→ Metals typically have 1, 2, or 3 valence electrons.
✔ Answer: 1,2 or 3

3. Non-metals have __________ electrons in the outermost shell.
→ Non-metals usually have 4, 5, 6, or 7 valence electrons.
✔ Answer: 4,5,6 or 7

4. The meaning of ‘octet’ is __________
→ Octet rule = having 8 electrons in outer shell for stability.
✔ Answer: to have 8 electrons in outermost shell

5. Elements in order to become stable __________ electrons.
→ They either lose or gain electrons to achieve octet. So “loose or gain” fits.
✔ Answer: loose or gain

6. Metals __________ electrons in order to become stable.
→ Metals lose electrons (they have few valence electrons).
✔ Answer: loose (meaning “lose”)

7. Non-metals __________ electrons in order to become stable.
→ Non-metals gain electrons to complete their octet.
✔ Answer: gain

8. Metals form __________ ions.
→ When metals lose electrons, they become positively charged → positive ions.
✔ Answer: positive

9. Non-metals form __________ ions.
→ When non-metals gain electrons, they become negatively charged → negative ions.
✔ Answer: negative

10. Positive ions are also known as __________
→ Positive ions = cations.
✔ Answer: cations

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All answers match the word bank exactly. No duplicates used incorrectly. All logic checks out with basic chemistry taught at Class VII level.

Final Answer:
1. eight
2. 1,2 or 3
3. 4,5,6 or 7
4. to have 8 electrons in outermost shell
5. loose or gain
6. loose
7. gain
8. positive
9. negative
10. cations