Question

2. Modern periodic table was proposed by __& consists of.
[ ]
a. Moseley,16 groups 8 periods
b. Mendeleef,8 groups 8 periods
b. Moseley,18 groups 8 periods
d. Mendeleef, 18 groups 7 periods
3. Elements with electronics​

Answer 1

Answer:

mandeleev 18 groups 7 periods

Answer 2

option d is right answer