Francium. It's outer shell is far enough away from the nucleus with its opposite, repelling positive charge which makes it difficult to exchange electrons. And its outer shell is incomplete.
To put it another way, of all the atoms that are missing an electron from their outer energy level, Francium is the one that has the least influence from the nucleus because its outer energy shell is the furthest away from the centre, so it is happiest to receive electrons.
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Electrostatic forces between the positively charged nucleus and the electron.
In a covalent bond if there is a difference of electronegativity between the atoms then the shared electrons are "attracted" to the most electronegative element.
Fluorine is the atom that has a strong tendency to attract electrons due to its high electronegativity. It is the most electronegative element on the Periodic Table.
An electronegative atom, which will have a tendency to attract electrons towards it will attract electrons.
The tendency of an atom to attract electrons is called electronegativity. It is a measure of an atom's ability to attract and hold onto electrons in a chemical bond.
electronegativity
the tendency of the atom to pull on electrons Apex : )
Electronegativity of an element refers to its power to attract electrons towards itself. Halogens are most electronegative elements in which fluorine has the highest electronegativity value.
Electronegativity is a measure of an atom's ability to attract and hold onto electrons in a chemical bond. It influences the distribution of charge in a molecule and helps to predict the nature of chemical bonds formed between atoms. Electronegativity tends to increase across a period and decrease down a group in the periodic table.