Question

an anion X- has 18 electrons.its mass number is 37 .how many neutrons are there in nucleus​

Answer 1

Since its an anion so it has gained 1 electron so no of electrons in its atom would be 18 -1 = 17. This means no of protons are 17 and no of neutrons =mass no - no of protons i.e 37 -17 =20 so no of neutrons =20

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Answer 2

Answer:

atomic no.= no.of electrons=no.ofprotons

here, element has gained 1 electron to get stable . so,

atomic no.=17,so no.of protons=17

as we know

mass no.=no.of neutrons+no.of protons

so,

37=no.of neutrons +17

no.of neutrons=37-17=20

so, no.of neutrons is 20 and element is

chlorine