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Semmelweis entrance exam chemistry Questions and Correct Answers/ Latest Update / Already Graded
What are the 4 main elements of living organisms? 
 Ans: carbon, nitrogen, oxygen, hydrogen 
 
What are atomic orbitals? 
 Ans: regions where there is a high probability of finding an 
electron 
 
What are the first few electron configurations? 
 Ans: 1s 
2s, 2p 
3s, 3p, 3d 
4s, 4p, 4d, 4f 
 
What are primary chemical bonds? 
 Ans: ionic, covalent, metallic 
 
What are secondary chemical bonds? 
 Page | 2 
 
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 Ans: 1. H