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Electronegativity increases up a group and across a period, going towards Fluorine, which is the most electronegative element. Electronegativity refers to an atom's ability to attract electrons, and since Fluorine only needs one more electron to complete its valence shell and have a full stable octet, it has a high electronegativity.
You can also use effective nuclear charge to describe the electronegativity trend, because it also increases in the top right corner of the periodic table. This means that atoms hold their electrons more tightly because the elements with more electrons and smaller radius have more protons, so there is a stronger positive charge pulling in the electrons to the center.
Electronegativity increases up a column and left to right across a period. The noble gasses are exceptions because they have a full octet so they are not trying to take any electrons. One way to think of electronegativity is how bad an atom wants an electron.
Electronegativity is the ability to pull in an electron. It increases across a period because the nuclear charge of atoms increase, meaning its ability to pull in an electron is greater. It increases up a group also because the nuclear charge of atoms increase.
Electronegativity increases to the right and going up. Electronegativity is the electron-pulling power of an atom. So as you go to the right on the table, the outer electron shell becomes increasingly full so the atom would want an electron more because it's closer to becoming stable with a full electron shell. It also decreases as you go down the periodic table because more shells means the valence electrons are further away from the nucleus so the pull of the nucleus isn't as strong.
Electronegativity refers to how strongly an atom attracts bonding electrons to itself. Higher electronegativity means an atom is more likely to attract electrons. EN increases from left to right because more protons means there is a stronger attracted between the positively charged nucleus and negatively charged electrons. EN increases from bottom to up because the fewer valence shells there are, the closer valence electrons are to the nucleus.
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