The common positive oxidation states for an element with atomic number 24 are:

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Z = 24 → Chromium (Cr)

Ground state:  (special half-filled stability)

Common oxidation states of Cr:

| O.S. | Example |
|------|---------|
| +1 |  |
| +3 | ,  (most stable) |
| +4 |  |
| +5 |  |
| +6 | ,  |

+2 is not a common state for Cr (unstable, strong reducing agent).

Common states: +1 and +3 to +6

Answer: Option (2)

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