Among Na, Mg and Al in period 3, which usually has the largest atomic radius?
A) Mg B) Al C) All are equal D) Na Answer: D Explanation: Effective nuclear attraction rises across the period. […]
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: […]
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