One atom has 12 protons and 12 neutrons. Another has 13 protons and 12 neutrons. Are they the same or different elements

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Solution

Dear student,

$A t o m i c n u m b e r = N o . o f p r o t o n H e r e 1 s t e l e m e n t h a s a t o m i c n o . = 12 2 n d e l e m e n t h a s a t o m i c n o . = 13 ∴ T h e s e b o t h a r e d i f f e r e n t a t o m s .$
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