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3 years ago

A) 4 b) 9 c) 11 d) 15

Chemistry

2 answers:

Bogdan [553]3 years ago

8 0

Answer:C

Explanation:brainliest plz

Zinaida [17]3 years ago

4 0

The answer is C hope this helps

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Calcium has a cubic closest packed structure (fcc) as a solid. Assuming that calcium has an atomic radius of 197 pm, calculate t

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Answer:

$1.536 g/cm^3$ is the density of solid calcium.

Explanation:

Formula used :

$\rho=\frac{Z\times M}{N_{A}\times a^{3}}$

where,

$\rho$ = density

Z = number of atom in unit cell

M = atomic mass

$(N_{A})$ = Avogadro's number

a = edge length of unit cell

We have:

r = 197 pm = $197\times 10^{-12} m = 197\times 10^{-12}\times 100 cm$

$r=197\times 10^{-10} m$

$a=r\times 2\sqrt{2}$

$a=197\times 10^{-10} m\times 2\sqrt{2}=557.200\times 10^{-10} cm$

M = 40 g/mol

Z = 4

On substituting all the given values , we will get the value of 'a'.

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$\rho =1.536 g/cm^3$

$1.536 g/cm^3$ is the density of solid calcium.

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3 years ago

What is in the nucleus of the atom

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Answer:

Umm i dont know but i think atomic nucleus

Explanation:

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