trends in the periodic table

Question 1

electronegativity

Answer 1

the relative attraction between a pair of electrons in a shared covalent bond

Question 2

atomic radii

Answer 2

half the distance between the nuclei of the two atoms of the same element that are joined together by a single bond

Question 3

first ionisation energy

Answer 3

the minimum energy required to completely remove the most loosely bound electron from a neutral gaseous atom in its ground state

Question 4

second ionisation energy

Answer 4

is the energy required to remove the an electron from an ion with one positive charge in the gaseous state