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Oksana_A [137]
3 years ago
15

1. Which of these electron transitions results in the emission of energy?

Chemistry
1 answer:
Wittaler [7]3 years ago
5 0

Answer:

19 - B

20 -C

Explanation:

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What is the energy required to remove an electron from an atom in the gaseous state called
KatRina [158]

Answer:

The energy required to remove the the electrons from gaseous atom is called  ionization energy.

Explanation:

Ionization energy:

The amount of energy required to remove the electron from gaseous atom is called ionization energy.

Trend of ionization energy in periodic table:

Along period:

The atomic size tend to decrease in same period of periodic table with increase of atomic number because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

Along group:

Atomic size increases with increase of atomic number from top to bottom. The nuclear attraction on valance shell became weaker and thus it becomes easy to remove an electron from valance shell and this can be done with less amount of energy. That's why  ionization energy decreases from top to bottom.

4 0
3 years ago
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I CHOSE GOLD!! PLEASE hELP
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Gold is the right answer, I looked it up!!!! Lol Hope this helps.
4 0
3 years ago
I'll give brainliest for a legitimate answer
miv72 [106K]

Answer:

I don't know if this is what you are looking for but maybe making paints out of things you find outside??? sry if this isn't what you were looking for

3 0
3 years ago
If a radioactive nuclide has a half-life of 1.3 billion years, and it is determined that a rock contains 12.5% of its original a
cupoosta [38]
<span>I would figure this out slowly. So the percentage would be 25 2.6 billion years ago. That would leave it at 50 percent 5.2 billion years ago. If you double that 50 percent to get 100% and double the 5.2 billion years you get 10.4 billion years. This would make the answer, the rock is 10.4 billion years old</span>
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Answer:

A. Mixture

Explanation:

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