Final answer:
An atom of element X forms an ion by gaining one electron, resulting in the symbol X-. An atom of element Y forms an ion by losing one electron, resulting in the symbol Y+. The number of protons, electrons, and neutrons in the ions formed from X and Y can be determined using the given information.
Step-by-step explanation:
(a) An atom of element X, with 17 protons and 17 electrons, will form an ion by gaining 1 electron. This results in an ion with 18 electrons. The symbol for this ion is X-.
(b) The number of protons, electrons, and neutrons in the ion formed from X will be: (i) 17 protons, (ii) 18 electrons, and (iii) 18 neutrons.
(c) An atom of element Y, with 11 protons and 11 electrons, will form an ion by losing 1 electron. This results in an ion with 10 electrons. The symbol for this ion is Y+.
(d) The number of protons, electrons, and neutrons in the ion formed from Y will be: (i) 11 protons, (ii) 10 electrons, and (iii) 12 neutrons.