Question

what is periodic table. State it's uses. Name the elements from the table=> Atomic no. 1,2,56,78,79,57,90,108,17. with symbol​

Answer 1

Answer:

Peridic Table was composed by Mosley.He only ordered the elements in increasing order of atomic number. It helps in the understanding of all the elements .

1 Hydrogen

2 Helium

Else see in the chart

Answer 2

Answer:

distinguish between sea water from pure water