Periodic Table & Periodicity

A) Mg B) Al C) All are equal D) Na Answer: D Explanation: Effective nuclear attraction rises across the period. […]

A) It always disappears B) It becomes zero at the bottom C) It increases D) It changes to a gas […]

A) It increases steadily B) It is identical for all elements C) It becomes a unit of pressure D) It […]

A) It always drops to zero B) It is identical in all atoms C) It becomes negative D) It generally […]

A) A horizontal row B) A vertical column C) A single isotope D) The number of neutrons only Answer: B […]

A) Total mass of the nucleus B) Charge of water molecules C) Net positive pull felt by an electron after […]

A) Energy change when a gaseous atom gains an electron B) Energy needed to move a planet C) A measure […]

A) Energy needed to remove an electron from a gaseous atom B) Energy released by boiling water C) Energy to […]

A) It increases in every step B) It becomes negative C) It equals atomic mass D) It decreases Answer: D […]

A) It always falls to zero B) It never varies C) It generally becomes negative D) It generally increases Answer: […]