Nitrogen makes up around 78% of the total atmosphere.
Answer:
Adding or removing energy from matter causes a physical change as matter moves from one state to another. For example, adding thermal energy (heat) to liquid water causes it to become steam or vapor (a gas). And removing energy from liquid water causes it to become ice (a solid).
Answer:
Scandium is the most reactive
Answer:
because they need only one electron
please check the attached image, i have given this answer b4
