Orbitals are defined by which term?

number of electrons

spin direction

composition

energy level

correct answer is energy level

Option (d) is the correct answer.

Explanation:

An orbital is defined as the energy shell which can contain a maximum of two electrons with opposite spins.

A wave like behavior of an electron is determined by an orbital and basically an orbital acts like a mathematical function.

For example, in a p-sub shell the orbitals present are , and .

Therefore, we can conclude that orbitals are defined by energy level.

Paris climate agreement of 2015

Explanation:

In the year 2015, global leaders seeking to join forces to combat the ever increasing emissions of green house gases which is having a bad influence on our prevailing world climate met in Paris in 2015, although the treaty became effective in the year 2016.

There are 195 signatories to the treaty. The Paris Agreement's long-term temperature goal is to keep the increase in global average temperature to well below 2 °C above pre-industrial levels; and to pursue efforts to limit the increase to 1.5 °C, recognizing that this would substantially reduce the risks and impacts of climate change.