What did John Newlands accomplish
toward the modern periodic table?
The law of triads, which states that
elements with similar properties exist in
groups of three.
The law of octaves, which states that
similar properties of elements were seen
between the element and the eighth
element following it in the table when
arranged by atomic mass.

a. an idea which cannot be disproven!

explanation:

b. safety skills, for handling tools and food products, and honesty, for following rules and regulations

explanation:

you do not need teaching skills if you work at a processing factory. you also don't need accuracy for closely inspecting equipment and operating heavy machinery safely if you are working at a processing factory. and lastly, you don't need accuracy for monitoring animals, and patience and determination, for observing and caring for animals. if you work at a processing factory, you don't need to care for animals.