Atomic Structure All subtopics
Which statement best describes the distribution of mass and charge within an atom?
The relative mass of an electron compared to a proton is approximately:
An ion is represented as ³²₁₆S²⁻. How many protons, neutrons and electrons does it contain?
Three beams — protons, neutrons and electrons — travelling at the same velocity enter an electric field between a positive plate (above) and a negative plate (below). Which row correctly describes the deflections?
Why do electrons deflect more strongly than protons in an electric field when both travel at the same velocity?
Which statement correctly explains why atomic radius decreases across Period 3 from Na to Cl?
Calculate the number of neutrons in an atom of ⁵⁶₂₆Fe.
In an isoelectronic series consisting of N³⁻, O²⁻, F⁻, Na⁺, Mg²⁺ and Al³⁺, which species has the smallest radius?
Why is a Mg²⁺ ion smaller than a neutral Mg atom?
A neutral atom of element X has a nucleon number of 39 and contains 20 neutrons. What is the proton number of X?
A hypothetical particle has charge +2 and a relative mass of 4. Compared with a proton beam of the same velocity in the same electric field, this particle beam would:
A chemistry student claims: “The radius of Cs is larger than that of Li because Cs has more electrons.” Which response best corrects this reasoning?
Which of the following describes a difference between two isotopes of the same element?
A research team detects a beam of unknown particles that passes between charged plates without any deflection. Which conclusion is most strongly supported?
Which species in the following list has the largest radius?
Define the term “isotope”.
How many neutrons are present in the isotope ³⁷₁₇Cl?
State why isotopes of the same element have identical chemical properties.
A neutral atom of an isotope is represented as ⁶⁵₃₀Zn. How many protons, neutrons and electrons does it contain?
Two samples of the same element, one made of the lighter isotope and one made of the heavier isotope, are compared at the same temperature. Which property will differ between the two samples?