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DIA [1.3K]
4 years ago
14

Write an electron configuration for an atom of aluminum-27 in an excited state

Chemistry
2 answers:
andrew11 [14]4 years ago
8 0
Ground state of Al  is 1s²2s²2p⁶3s²3p¹.
Exited state of Al is 1s²2s²2p⁶3s¹3p².
Alexus [3.1K]4 years ago
8 0

Answer: 1s^22s^22p^63s^13p^2.

Explanation:

Electronic configuration is defined as the distribution of electrons in the energy levels around an atomic nucleus.

Atomic number helps in determining the electronic distribution  of an atom. We write electronic configuration according to Aufbau's principle in which shells are arranged in increasing energy levels.

Aluminium (Al) is a p block element and its atomic number is 13.

Electronic configuration of aluminium is 1s^22s^22p^63s^23p^1.

Excite state is achieved when the electron moves to a higher energy level.The 3s electron moves to 3p orbital so that it can form three bonds.

Thus Electronic configuration of aluminium in an excited state is 1s^22s^22p^63s^13p^2.

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sveticcg [70]
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4 0
4 years ago
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How old is a bone if it now .3125 of C-14 when it originally had 80.0g of C-14
Taya2010 [7]
<h3>Answer:</h3>

42960 years

<h3>Explanation:</h3>

<u>We are given;</u>

  • Remaining mass of C-14 in a bone is 0.3125 g
  • Original mass of C-14 on the bone is 80.0 g
  • Half life of C-14 is 5370 years

We are required to determine the age of the bone;

  • Using the formula;
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Therefore;

0.3125 g = 80.0 g × 0.5^n

3.90625 × 10^-3 = 0.5^n

  • Introducing logarithm on both sides;

log 3.90625 × 10^-3 = n log 0.5

Solving for n

n = log 3.90625 × 10^-3 ÷ log 0.5

   = 8

  • Therefore, the number of half lives is 8
  • But, 1 half life is 5370 years
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Age of the rock = 5370 years × 8

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Thus, the bone is 42960 years old

7 0
3 years ago
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Sergio039 [100]

Answer:

Different properties

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They are different.

8 0
3 years ago
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The density of the rock after it had being placed in the cylinder of water so the calculation should look like this:

Volume of water substract the mass of the rock:

And that is 142.5 ml - 86.59g =

Answer 55.91 g/ml

So the density of the rock is 55.91g/ml

5 0
3 years ago
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katovenus [111]

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