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Which of the following is not a property of lanthanides?
- a)They are soft metals with white silvery color
- b)They tarnish rapidly by air
- c)The hardness of the metals increases with increase in the atomic number
- d)The melting point of the metal ranges from 500-1000K
Correct answer is option 'D'. Can you explain this answer?
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Which of the following is not a property of lanthanides?a)They are sof...
All lanthanides are soft metals with silvery white color. They tarnish rapidly by air. With increase in atomic number, the harness of these metals also increases. The melting points of the lanthanides ranges from 1000 to 1200K but samarium melts at 1623K.
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Which of the following is not a property of lanthanides?a)They are sof...
Explanation:
Lanthanides, also known as rare earth elements, are a group of 15 metallic elements that are part of the f-block in the periodic table. They have similar properties due to their electron configurations and are commonly used in various applications such as magnets, catalysts, and lighting.
The correct answer is option 'D': The melting point of the metal ranges from 500-1000K.
Properties of Lanthanides:
1. They are soft metals with white silvery color: Lanthanides are malleable and ductile, which means they can be easily shaped and drawn into wires. They have a characteristic white silvery appearance.
2. They tarnish rapidly by air: Lanthanides react with oxygen in the air and form an oxide layer on their surface. This oxide layer can give them a tarnished appearance.
3. The hardness of the metals increases with an increase in atomic number: The lanthanide series follows a trend where the hardness of the metals generally increases as the atomic number increases. This is due to the increasing number of electrons and the strengthening of metallic bonds.
4. The melting point of the metal ranges from 500-1000K: This statement is incorrect. The melting points of lanthanides vary widely across the series. For example, cerium has a melting point of 798°C (1071K), while lutetium has a melting point of 1652°C (1925K). The melting points generally increase across the series, but there are exceptions and variations.
Conclusion:
In conclusion, the property of lanthanides that is not correct is that the melting point of the metal ranges from 500-1000K. The melting points of lanthanides vary across the series, and they generally increase but with exceptions and variations.
Lanthanides, also known as rare earth elements, are a group of 15 metallic elements that are part of the f-block in the periodic table. They have similar properties due to their electron configurations and are commonly used in various applications such as magnets, catalysts, and lighting.
The correct answer is option 'D': The melting point of the metal ranges from 500-1000K.
Properties of Lanthanides:
1. They are soft metals with white silvery color: Lanthanides are malleable and ductile, which means they can be easily shaped and drawn into wires. They have a characteristic white silvery appearance.
2. They tarnish rapidly by air: Lanthanides react with oxygen in the air and form an oxide layer on their surface. This oxide layer can give them a tarnished appearance.
3. The hardness of the metals increases with an increase in atomic number: The lanthanide series follows a trend where the hardness of the metals generally increases as the atomic number increases. This is due to the increasing number of electrons and the strengthening of metallic bonds.
4. The melting point of the metal ranges from 500-1000K: This statement is incorrect. The melting points of lanthanides vary widely across the series. For example, cerium has a melting point of 798°C (1071K), while lutetium has a melting point of 1652°C (1925K). The melting points generally increase across the series, but there are exceptions and variations.
Conclusion:
In conclusion, the property of lanthanides that is not correct is that the melting point of the metal ranges from 500-1000K. The melting points of lanthanides vary across the series, and they generally increase but with exceptions and variations.
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Which of the following is not a property of lanthanides?a)They are soft metals with white silvery colorb)They tarnish rapidly by airc)The hardness of the metals increases with increase in the atomic numberd)The melting point of the metal ranges from 500-1000KCorrect answer is option 'D'. Can you explain this answer?
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Which of the following is not a property of lanthanides?a)They are soft metals with white silvery colorb)They tarnish rapidly by airc)The hardness of the metals increases with increase in the atomic numberd)The melting point of the metal ranges from 500-1000KCorrect answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Which of the following is not a property of lanthanides?a)They are soft metals with white silvery colorb)They tarnish rapidly by airc)The hardness of the metals increases with increase in the atomic numberd)The melting point of the metal ranges from 500-1000KCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is not a property of lanthanides?a)They are soft metals with white silvery colorb)They tarnish rapidly by airc)The hardness of the metals increases with increase in the atomic numberd)The melting point of the metal ranges from 500-1000KCorrect answer is option 'D'. Can you explain this answer?.
Which of the following is not a property of lanthanides?a)They are soft metals with white silvery colorb)They tarnish rapidly by airc)The hardness of the metals increases with increase in the atomic numberd)The melting point of the metal ranges from 500-1000KCorrect answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Which of the following is not a property of lanthanides?a)They are soft metals with white silvery colorb)They tarnish rapidly by airc)The hardness of the metals increases with increase in the atomic numberd)The melting point of the metal ranges from 500-1000KCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following is not a property of lanthanides?a)They are soft metals with white silvery colorb)They tarnish rapidly by airc)The hardness of the metals increases with increase in the atomic numberd)The melting point of the metal ranges from 500-1000KCorrect answer is option 'D'. Can you explain this answer?.
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