If the number of protons in one atom of an element Y is 20, then the number of electrons in its ion Y²⁺ will be:

58 The rechargeable battery used in a mobile phone hand set is usually: 60 The number of protons in one atom of an element X is 8. What will be the number of electrons in its ion x^2-? 62 The noble gas having only two electrons in its valence shell is: 63 A covalent molecule having a double bond between its atoms is: