engineering recuitment DRDO CEPTAM STA B Tier I (Sr. Technical Assistant) Mock Test 2022 General Science Chemistry Structure of Atom
Two elements are represented as \({{^{38}_{18}X}} \ \rm{and} \ {{ ^{80}_{35}Y}}\) the ratio of neutrons present in the atoms of these element is
1
1 : 2
2
4 : 9
3
4 : 8
4
2 : 4