Why does Zinc (Zn) have a lower density compared to other metals?

Zinc (Zn) has a relatively low density compared to other metals because of its atomic structure. Here’s why:

1. Atomic Size: Zinc atoms are relatively large compared to other metal atoms. This means that, in a given volume, fewer zinc atoms can fit compared to smaller atoms like iron or copper.

2. Atomic Arrangement: The way zinc atoms are arranged in the solid form also influences its density. Zinc crystallizes in a hexagonal close-packed structure. While this is a dense packing arrangement, it’s not as efficient as the cubic close-packed structure found in metals like copper and gold.

3. Electron Configuration: The electron configuration of zinc contributes to the way atoms bond and arrange themselves. Zinc has a completely filled d-orbital, which affects its metallic bonding and, consequently, its packing in the solid state.

4. Atomic Weight: Zinc has a relatively high atomic weight (about 65.38 u). However, density is not solely dependent on atomic weight; it’s also about how closely the atoms pack together. So, despite its higher atomic weight, the larger atomic size and specific packing structure result in a lower density.

5. Interatomic Spaces: The specific arrangement of atoms in zinc results in more interatomic space compared to more densely packed metals. This space contributes to a lower overall density.

In summary, zinc’s low density is a result of its larger atomic size, its specific atomic arrangement in the solid state, and the amount of space between its atoms.

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