what where the criteria used by mandeleev in creating his periodic table?what are the isotops?give example
Answers
Answered by
2
Answer:
Based on atomic masses of elements .In period, elements are arranged in increasing order of atomic mass. In group, elements of similar properties are arranged.This periodic table contains 7 horizontal periods and 8 vertical group . 1 to 7 all groups are divided into two sub groups A and B while 8 group divided into three sub groups.
Isotopes having same atomic number but different mass number . Example isotopes of hydrogen and isotopes of carbon
Attachments:
Similar questions