Civil Services HPPSC (Himachal Pradesh) HPAS Mock Test 2021 General Science Chemistry Basic Concepts of Chemistry

ଯଦି ଏକ ଉପାଦାନର ପରମାଣୁରେ ଏହାର 11 ଟି ପ୍ରୋଟନ୍ ଏବଂ 12 ଟି ନ୍ୟୁଟ୍ରନ୍ ଥାଏ, ତେବେ ଉପାଦାନର ବସ୍ତୁତ୍ଵ ସଂଖ୍ୟା ହେଉଛି:

1
35
2
12
3
23
4
11
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