is the author of the article suggesting that there are exceptions to the general indicators of chemical or physical changes? Which selection from the article BEST supports your answer?

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

Do you have any options?