Answer: option C) 3.0
Explanation:
The electronegative value of an element indicates the power of its atom to attract an electron. It ranges from 0 to 4.
Ionic bond is formed between two elements with WIDE difference in electronegative values. e.g Sodium with 0.93 and Chlorine with 3.16 forms an ionic bond in NaCl with a difference of 2.23
Thus, a difference of up to 3.0 makes an ionic bond
