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ki77a [65]
3 years ago
9

Brainliest if correct!!!

Chemistry
1 answer:
irina [24]3 years ago
5 0

Answer:

D

Explanation:

in an endothermic reaction the reaction consumes the energy around it

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The atomic number of gold (Au) is 79, and it has a mass number of 197. How many electrons are present in each atom of gold?
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3 years ago
What are the trends and exceptions to the trends in electron affinity
slega [8]

Answer:

Explanation:

Electron affinity is the energy released in adding an electron to a neutral atom in the gas phase.

It is a measure of the readiness of an atom to gain an electron. This property is very peculiar to non-metals. The higher the value, the greater the tendency to accept electrons.

Across a period electron affinity increases due to the increasing nuclear charge not being compensated for.

Down a group, electron affinity decreases  due to the low nuclear charge and the large atomic radii.

The exception to this rule is the stability of half-filled sublevels. For example, nitrogen has a configuration of 2,5 with sublevel notation of 1s²2s²2p³.

The p-sublevel has a degeneracy of three and the three electrons goes in singly. This makes the configuration stable.

We expect such an atom to have a higher electron affinity but its configuration is stable and carbon would have a higher affinity than it across the same period.

Half filled sublevels are exception to the trend of electron affinity.

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4 years ago
Light acts like a
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Why is gold found in the pure state in nature?
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The positively charged particle of an atom is called
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