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svet-max [94.6K]
2 years ago
7

Could someone please help me? You can ignore number 3:)

Chemistry
1 answer:
il63 [147K]2 years ago
6 0

Answer:

Question 2: Because the elements could be unstable, forming elemental compounds.

Question 1: Water is made up of Hydrogen and oxygen, which is namely called H2^o What makes it a pure substance is the little mass and molecules it's made up of.

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Which electron transition represents a gain of energy
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The transition from lower energy level to higher energy level require a gain of energy.

Explanation:

When transition occur from lower energy level to higher energy level require a gain of energy. Electron could not jump unto higher energy level without gaining thew energy.

When electron jump into lower energy level from high energy level it loses the energy.

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De-excitation:

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3 0
3 years ago
What is 256ml to liters
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~Mqddie
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Answer:

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