Short Trick to Learn Formal Charge – Chemistry Mnemonics

Trick to Learn Formal Charge: Notes preparation is necessary for the students for the preparation of National Eligibility cum Entrance Examination (NEET). The exam is common test exam conducted for the students to take admission in medical colleges. The students who have studied biology as subject in science stream can apply for the exam and start their preparation for the exam. Students can check Short Tricks, notes, syllabus, mock test here at 

Trick to Learn Formal Charge

These Short Tricks (Mnemonics) on Trick to Learn Formal Charge are very helpful for various Medical Entrance Exam like NEET, AIIMS, JIPMER, PGIMER, CBSE Board, ICSE Board, Class 12th, 11th. Here are some mnemonic of this chapter topics listed below. These are very helpful for class 11th and 12th students :-

Trick to Learn Formal Charge

Number of valance electrons – (No. of unshared electrons + No. of bonds)

Example – 


Structure of (NH4)+

Formal Charge of N = 5 – (0+4)  = +1

Formal Charge of H = 1 – (0+1 )   = 0

So, Formal Charge of NH4+ = 0+1 = +1


Structure of CO32-
Formal Charge of C = 4 – (0 + 4)  = 0

Formal Charge of O(a) = 6 – (6+1) = -1

Formal Charge of O(b) = 6 – (6+1) = -1

Formal Charge of O(c) = 6 – (4+2)  = 0

So,  Formal Charge of (CO3)-2 =  -2 

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