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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)39
- d)40
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
An element has 18 electrons, and 20 .neutrons. Its charge is —2....
Atomic mass of element = Number of proton + Number of neutron
Number of proton = Number of electron
It is given that charge on element is -2 it means it is anion.
Atomic mass = 18 + 20 = 38 Answer
Most Upvoted Answer
An element has 18 electrons, and 20 .neutrons. Its charge is —2....
Answer is 'd' becoz charge is -2 so the total electron is 20.. No of elctron = no. Of proton 20=20 Mass no. = no. Of proton + no of neutron = 20+20 =40
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Community Answer
An element has 18 electrons, and 20 .neutrons. Its charge is —2....
Number of orbitals in a shell = n2 = (5)2 = 25
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An element has 18 electrons, and 20 .neutrons. Its charge is —2. What is its mass number?a)32b)38c)39d)40Correct answer is option 'C'. Can you explain this answer?
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