Question

what is electronegativity? what is a periodicity in periodic table (long answer ) ​

Answer 1

Answer:

Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons. An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.

Electronegativity - A measure of how readily an atom forms a chemical bond. Electronegativity increases moving left to right across a period and decrease moving down a group.

Answer 2

Answer:

Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons. An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.

The periodicity in properties is due to repetition of similar outer shell electronic configuration at a certain regular intervals. ... In the modern periodic table, the elements are arranged in rows and columns. These rows and columns are known as periods and groups respectively.