Answer:
Ions form when an atom gains or loses electrons in order to find a more stable configuration.There are two types of ions cations and anions
Explanation:
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<span>In elastic deformation, strain is recovered when stress is removed, but in brittle deformation, the object fractures.
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In brittle rocks, the failure point is very close the yield strength, and so can only accommodate very little strain before failure. Ductile rocks have a failure point that is much higher than the yield strength, and so can accommodate permanent strain before failure.
The oxidation number of chromium (Cr) in CrO₂, Cr₂O₇²⁻ and Cr₂(SO₄)₃³⁻ is +4, +6 and +1.5 respectively.
<h3>What is oxidation number?</h3>
Oxidation number of any compound gives idea about the number of exchangeable electrons from the outer most shell of an atom.
Let the oxidation state of chromium is x and charge on the whole molecule is zero, so it will be calculated as:
x + 2(-2) = 0
x - 4 = 0
x = +4
Let the oxidation state of chromium is x and charge on the whole molecule is -2, so it will be calculated as:
2x + 7(-2) = -2
2x - 14 = -2
2x = 12
x = +6
Let the oxidation state of chromium is x and charge on the whole molecule is -3, so it will be calculated as:
2x + 3(-2) = -3
2x - 6 = -3
2x = 3
x = +1.5 (which is impossible)
Hence oxidation state of chromium atom in CrO₂, Cr₂O₇²⁻ and Cr₂(SO₄)₃³⁻ is +4, +6 and +1.5 respectively.
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Answer:
large atoms have Valence electrons further from the nucleus and lose them more readily.