Question

Name:
1. An element with zero neutron.
2. Chemical compound responsible for permanent hardness.

Answer 1

Answer:

Explanation:

1 hydrogen

2 calcium sulphate

Answer 2

An element with zero neutrons -Hydrogen.

Chemical compound responsible for permanent hardness -chloride, sulfate and nitrates of Calcium & magnesium  

Hydrogen is an element that has no neutron in its nucleus. It has only one proton and one electron. An isotope of hydrogen is protium; it is a simplest atom and has only one proton, one electron and no neutron.  

Permanent hardness is due the presence of mineral salts mainly calcium sulfate that cannot be removed even by boiling.