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3 years ago

Which statement is true with respect to an atom?

Chemistry

1 answer:

MissTica3 years ago

7 0

Smallest particle of a(chemical) element

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Which sequence of group 18 elements demonstrates a gradual decrease in forces of attraction

DanielleElmas [232]

Answer: Xe, Kr, Ar, Ne

Explanation:

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4 years ago

45. most abundant metal in the earth's crust<br> 46. first discovered in light coming from the sun

Yanka [14]

Answer:

45. Aluminum

46. helium

Explanation:

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3 years ago

Substance A and B are the same mass and at the same initial temperature. When the same amount of heat is added to each, the fina

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3 years ago

Plz help chemistry test

Nataly [62]

Answer:

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3 years ago

The Al2O3 crystal structure (corundum) consists of an HCP arrangement of O2- ions; the Al3+ ions occupy octahedral positions. Wh

vesna_86 [32]

Answer:

The fraction of the available octahedral positions are filled with $Al^{3+}$ ions is $\frac{2}{3}$

Explanation:

If there are n numbers of spheres in HCP in packing:

Number of octahedral void = n

Number of tetrahedral void = 2n

Total number of voids = n + 2n = 3n

The $Al_2O_3$ crystal structure consists of an HCP arrangement of $O^{2-}$ ions.

Number of spheres in HCP = 6

Number of $O^{2-}$ = 6

Number of octahedral voids = 6

Number of tetrahedral void = 12

Number of aluminum ions when there are 6 $O^{2-}$ ion = $\frac{2}{3}\times 6= 4$

Number of voids in which $Al^3+$ ions are present = 4

The fraction of the available octahedral positions are filled with $Al^{3+}$ ions = $\frac{4}{6}=\frac{2}{3}$

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4 years ago