As you go across the period the atomic radius decreases due to the nuclear charge increasing. So there is a greater electrostatic forces of attraction between the nucleus and outer electrons
Electronegativity increases as nuclear charge increases, atomic radius decreases and shielding stays the same. So there is a greater electrostatic forces of attraction between the nucleus and shared electrons
Firsts ionisation energy increases as nucleaur charge increases, atomic radius decreases and shielding remains the same. So there is a greater electrostatic forces of attraction so more energy is needed to remove the outer electron
