Question

Editing and omission the sentence

Time and again we had
seen which a good teacher
with a desire of care can remove all the difficulty
in the lives of the students.

Answer 1

Answer:

composition of the nuclei of to atomic species x and y are given as under SY protons is much to six and six Nations 6 and 8 these two atomic species X and Y have the same atomic number but different mass number and they are isotopes