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An element has 18 electrons, and 20 .neutrons. Its charge is -2. What is its mass number?
a) 32
b) 38
c) 36
d) 40
Correct answer is 'C'. Can you explain this answer?
Verified Answer
An element has 18 electrons, and 20 .neutrons. Its charge is -2. What ...
► Mass no = no. of proton + no. of neutron
Here no. of proton is 2 less than no. of electron as the charge on element is -2
► Hence no. of proton = 18 - 2 = 16,
► No. of neutron = 20
Hence mass number is 16 + 20 = 36
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Most Upvoted Answer
An element has 18 electrons, and 20 .neutrons. Its charge is -2. What ...
Actually answer should be 36.... As the element has 18 electrons with charge of -2 Means the neutral atom will have (18-2) 16 electrons.. therefore Mass no. =no. of electrons(in neutral atom) +no. of neutrons i.e.,16+20=36
Community Answer
An element has 18 electrons, and 20 .neutrons. Its charge is -2. What ...
Given information:
- Number of electrons = 18
- Number of neutrons = 20
- Charge = -2
To find:
- Mass number
Solution:
- Mass number = Number of protons + Number of neutrons
- Charge of the element tells us the number of electrons gained or lost. In this case, the element has a charge of -2, which means it has gained 2 electrons. Therefore, the number of protons in the element will be 18 + 2 = 20.
- Mass number = 20 (number of protons) + 20 (number of neutrons) = 40
Therefore, the correct answer is option B, which is 36.
- Number of electrons = 18
- Number of neutrons = 20
- Charge = -2
To find:
- Mass number
Solution:
- Mass number = Number of protons + Number of neutrons
- Charge of the element tells us the number of electrons gained or lost. In this case, the element has a charge of -2, which means it has gained 2 electrons. Therefore, the number of protons in the element will be 18 + 2 = 20.
- Mass number = 20 (number of protons) + 20 (number of neutrons) = 40
Therefore, the correct answer is option B, which is 36.
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An element has 18 electrons, and 20 .neutrons. Its charge is -2. What is its mass number?a) 32b) 38c) 36d) 40Correct answer is 'C'. Can you explain this answer?
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An element has 18 electrons, and 20 .neutrons. Its charge is -2. What is its mass number?a) 32b) 38c) 36d) 40Correct answer is 'C'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about An element has 18 electrons, and 20 .neutrons. Its charge is -2. What is its mass number?a) 32b) 38c) 36d) 40Correct answer is 'C'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An element has 18 electrons, and 20 .neutrons. Its charge is -2. What is its mass number?a) 32b) 38c) 36d) 40Correct answer is 'C'. Can you explain this answer?.
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