Questions

Electrons orbit around the nucleus is correct about them.

1 atm: It was originally defined as the pressure exerted by 760 mm of mercury at 0 °C and standard gravity (g = 9.80665 m/s2).

Nickel

Biodegradable substances can be broken down into simpler, harmless substances in nature with due course of time by the biological process such as action of microbes. They can be recycled as a part of food chain.

Here, Leather bags are biodegradable.

Pearl Harbour is an American Naval base in Hawaii

Homer's literature had created the foundation for literature and was influential in his time and the future. And they are credited as foundational components of the Western worldview.