Which element has the greatest electronegativity? A. iodine (t), located near the bottom of Group 7A
B. potassium (K), located in the middle of Group 1A
C. fluorine (F), located at the top of Group 7A
D. silicon (Si), a metalloid in Group 4A

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

pie chart because it is in percents ( % )