engineering recuitment NPCIL Plant Operator Mock Test General Science Chemistry Structure of Atom

ନିମ୍ନଲିଖିତ ଉପାଦାନ ମଧ୍ୟରୁ କେଉଁଥିରେ କୌଣସି ନିଉଟ୍ରନ୍ ନ ଥାଏ?

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ହିଲିୟମ୍
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ବୋରନ୍ 
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ବେରିଲିୟମ୍ 
4
ହାଇଡ୍ରୋଜେନ 
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