Protactinium-231 undergoes alpha decay as shown: 231 Pa → 2X + He
Enter the appropriate values for A and Z and the chemical
symbol for X

Any photo? or something

12 is probably the typical age for a first kiss but i think its to young.

☆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