Chemistry - PERIODIC TABLE Question with Solution | TestHub
The development of periodic table has been done throughout many years by various Scientists and Research Scholars. Mendeleev is widely regarded as Father of Periodic table since he was the first person who presented a systematic study of elements in the form of a table. Notable contributions were made by Lother meyer and others as well. Moseley modified the Mendeleev's Table by proposing Atomic number as a better function of properties as compared to Atomic mass and then Modern periodic table lay its foundation.
Number of elements among the following whose properties were predicted by Mendeleev but a gap was left in their place since they weren't discovered at that time is__________
Boron, Gallium, Germanium, Silicon, Manganese, Technitium, Scandium, Aluminium, Xenon and Nitrogen.
Answer:
Solution:
Gallium, Scandium, Germanium and Technitium