Q(10):The atom of an element X contains 17 protons, 17 electrons and 18 neutrons whereas the atom of an element Y contains 11 protons, 11 electrons and 12 neutrons. (a) What type of ions will be formed by an atom of element X ? (b) What will be the number of electrons in the ion formed form X ? (c) What type of ion will be formed by an atom of element Y ?
Answers
Explanation:
Symbol of the positively charged Y is Y+. Atomic number of X is 17; therefore, element X is chlorine. Atomic number of Y is 11; therefore, element Y is sodium.
Answer:
Element X consists of 17 protons and electrons and 18 neutrons. Element X will readily accept an electron to form a negatively charged anion.
The symbol of the negatively charged X is X∠’.
(b) In the ion formed by X:
(i) Number of protons = 17
(ii) Number of electrons = 18
(iii) Number of neutrons = 18
(c) Element Y consists of 11 protons and electrons and 12 neutrons. Element Y will readily lose an electron to form a positively charged cation.
The symbol of the positively charged Y is Y+.
(d) In the ion formed by Y:
(i) Number of protons = 11
(ii) Number of electrons = 10
(iii) Number of neutrons = 12
(e) (i) Atomic mass of X = number of protons of X + number of neutrons of X
= 17 + 18
= 35 u
(ii) Atomic mass of Y = number of protons of Y + number of neutrons of Y =
11 + 12
= 23 u
(f) Atomic number of X is 17; therefore, element X is chlorine.
The atomic number of Y is 11; therefore, element Y is sodium.