Fill in the blanks1. In Dobereiner’s triads, the atomic weight of th

1.	Fill in the blanks1. In Dobereiner’s triads, the atomic weight of the middle element is the ………… of the atomic masses of 1st and 3rd elements. 2. Noble gases belong to ………… group of the periodic table. 3. The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was ………… 4. Example for liquid metal is …………
Answer» 1. average 2. 18th 3. atomic masses 4. Mercury

Fill in the blanks1. In Dobereiner’s triads, the atomic weight of the middle element is the ………… of the atomic masses of 1st and 3rd elements. 2. Noble gases belong to ………… group of the periodic table. 3. The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was ………… 4. Example for liquid metal is …………

Answer»

1. average

2. 18th

3. atomic masses

4. Mercury