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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?
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
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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)= 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)39​d)40Correct answer is option 'C'. Can you explain this answer?
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