4 ethyl-2,3-dimethylheptane

Olá. porque a reação na temperatura é muito rapida a do copo : )

Less stable  hope this

No. an alpha particle is a pair of protons and a pair of neutrons, i.e. a helium

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts