Question

17. Who developed long form of the periodic table?
(a) Lothar Meyer (b) Neils Bohr
(c) Mendeleev
(d) Moseley

18. At present, how many elements are known
(b) 112
(c) 113
(d) 118
(a)
110​

Answer 1

Answer:

17) niels bohr. 18)118

Explanation:

this is the correct answer. HOPE THIS HELPS

Answer 2

Ans

Explanation:

Bhor developed long form of periodic table.118 elements have been discovered presently.