Question

question 4 which of the following elements does not form an ion with a charge of 1+? sodium hydrogen fluorine potassium

Explanation:

Step1: Recall element - ion formation rules

Elements in Group 1 of the periodic table easily lose one electron to form a + 1 ion. Sodium (Na), hydrogen (H), and potassium (K) are in Group 1 or can form a + 1 ion under certain conditions.

Step2: Analyze fluorine

Fluorine is a halogen in Group 17. It has 7 valence electrons and gains 1 electron to form a fluoride ion ($F^-$) with a charge of - 1, not + 1.

Answer:

C. fluorine