Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति
UPSC
Chemistry
Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति
Question Bank
Elements Classification and Chemical Bonding
question_answer
The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all -