Final answer:
Electronegativity refers to the tendency of atoms to attract electrons. The elements in group 6A and 7A have high electronegativities, meaning they have a strong tendency to attract electrons towards themselves in a chemical compound.
Step-by-step explanation:
Electronegativity refers to the tendency of atoms to attract electrons. The electronegativity of elements increases from left to right across a period in the periodic table and decreases down a group. The nonmetals, which are located in the upper right, generally have the highest electronegativities. For example, fluorine has the highest electronegativity of all elements (EN = 4.0). Metals, on the other hand, tend to have lower electronegativities, and the group 1 metals have the lowest electronegativities.
To answer your question, the elements in group 6A and 7A have atoms with the most pulling potential for an electron. The nonmetals in these groups, such as oxygen in group 6A and fluorine in group 7A, have high electronegativities. This means that they have a strong tendency to attract electrons towards themselves in a chemical compound.
It's important to note that electronegativity is a relative scale and is mainly used to predict the behavior of elements in chemical reactions.