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8 December, 02:31

What element mass number is 11 has 6 neutrons and average mass number of 10.81?

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  1. 8 December, 02:36
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    Valence electron - 2.8.1 (mass number 11), so it is situated in group 1. The mass number indicates Na - sodium. Proton number would be 11+6=17. Neutron number is counted by subtracting mass number and proton number. So I conclusion the ans would be sodium.
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