A negative ion of an atom element Xhas18 electrons and 16 protons . Calculatethe number of electrons and protons in its corresponding atom . Also calculate the number of nuetrons , if the mass number is units than double the number of protons.

A negative ion of an atom element Xhas18 electrons and 16 protons . Ca

1.	A negative ion of an atom element Xhas18 electrons and 16 protons . Calculatethe number of electrons and protons in its corresponding atom . Also calculate the number of nuetrons , if the mass number is units than double the number of protons.
Answer» Solution :16 protons MEANS that the atomic number of the element (X) is 16 . Thatis the ELECTRONIC configuration is , 2 , 8 , 6. It has to gain twoelectrons to attain octet configuration . Hence , the dinegative ion possesses 18 ELECTRONS. `(X^(-2))=16+2=18`. Mass number = 2+ 2 (number of protons) = 2 + 2 (16) = 34 `:.:.`Number of NEUTRONS = 18