Ta có 2p+n = 34
Mà \(p\le n\le1,5p\)
=>\(3p\le2p+n=34\le3,5p\)
=>\(9,7\le p\le11,33\)
=>\(\left[{}\begin{matrix}p=10=>n=14=>e\\p=11=>n=12\end{matrix}\right.\)
=>\(A=p+n=23=>Natri\left(Na\right)\)
Ta có
p+n+e=34
=>2p+n=34 => n=34-2p
Mặt khác
p\(\le n\le1,5p\)
p\(\le34-2p\le1,5p\)
=>3p\(\le34\le3,5p\)
=> 9,71\(\le11,33\)
=> p=\(\left[{}\begin{matrix}10\left(Ne\right)\\11\left(Na\right)\end{matrix}\right.\)
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