Convective uplift-the hot air is less dense and it rises
orographic lifting-air is forced to rise when it meets a mountain
convergence-thunderstorms are caused by comvergence
frontal wedging-when a cold air mass meets a warm air mass, the colder air wedges its way beneath the less dense warm air
https://quizlet.com/133729750/four-mechanisms-that-cause-air-to-rise-flash-cards/
Here is a link to a website that explains these observed trends.
https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Book%3A_Introductory_Chemistry_(CK-12)/06%3A_The_Periodic_Table/6.15%3A_Periodic_Trends%3A_Atomic_Radius
Molecules are farthest apart in a gaseous state and closest together in a solid state. Liquid state is in the middle. Just think of the things you encounter everyday, you can't move your hand through a desk because it is comprised of molecules that are held so close together through various forces and molecular interactions.
<span>The question says.'which option describes a similarity between isotopes of an element. The correct option is C. Isotopes have the same number of atomic number but different mass number. The mass number is the summation of proton and neutron. The number of proton is always constant but that of neutron changes to reflect the existence of isotopes.</span>