The atomic number of an element B is 17. The number of electrons in its ion B will be: (a) 17 (b) 18. (c) 19. (d) 20.
answer with explanation

Aresearcher believes increased perceived control influence the well-being of residents at a nursing home. to test this , she allowed one group of residents to have control over their daily lies, (where to eat etc) . the other group of 5 residents had these deceisions made by staff. the resident's feelings of well-being were measured on a 10 point scale at the end of a one month trial period. is there a difference on well-being?