In the modern quantum-based atomic theory, what is the name given to a particular space around the nucleus in which an electron moves? a. orbit b. nucleus c. energy level d. orbital

Idon't understand what to put on the left lines i'm confused can anyone ?

Margaret wants to make an orange flavored drink by stirring powdered drink mix into a glass of water. she doesn't like drinks that have small clumps of powdered solid in them, so she wants the drink to be a perfect solution. what factors should margaret not consider when deciding how much powder to add to her glass of water?

Which position represents spring in the southern hemisphere? a) b) c) d)