A certain element has only two naturally occurring isotopes: one with 18 neutrons and the other with 20 neutro

A certain element has only two naturally occurring isotopes: one
with 18 neutrons and the other with 20 neutrons. The element
forms 1charged ions when in ionic compounds. Predict the identity
of the element. What number of electrons does the 1 charged
ion have?

Can someone guide me on how to answer this?

1 charged ion:
==> either Group 1 or Group 7 ( X鈦?or Y鈦?

Group 1:

鈧佲倎Na 鈲?br> 鈧佲倝K 鉁? ==> { K-39 = 20 neutrons, K-40 = 21 neutrons and K-41= 22 neutrons }
鈧冣倗Rb
鈧呪倕Cs
鈧堚倗Fr
definitely not group 1


Group 7
鈧塅 鈲?br> 鈧佲倗Cl 鉁?==> { Cl-35 = 18 neutrons, Cl-37 = 20 neutrons }
鈧冣倕Br
鈧呪們I

``````````````

identity:
Cl
``````` Element is Chlorine:

1 charged ion
Cl + e鈦?鈫?Cl鈦?
17 + 1 = 18

18 electrons
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What happened to my edit of my answer? I acknowledged that I finally understood that "1charged ion" meant "one charged ion"" and gave kudos to cguy.

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What do you mean by "The element forms 1charged ions"? Do you mean "+1 charged ions"?

Please clarify this so that we can help you.