Chemistry
Periodic Classification and Elements
1,092 Questions
Periodic classification organizes chemical elements based on atomic structure, periodic laws, and elemental properties. It covers historical classification systems, electron configurations, and periodic trends. Test takers preparing for chemistry sections will find these questions crucial for mastering fundamental element properties and atomic interactions.
Periodic table structureAtomic orbitalsElement identificationPeriodic laws
Periodic Classification and Elements Questions
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Ce: [Xe] 4f1 5d1 6s2
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Nd: [Xe] 4f3 5d1 6s2
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Sm: [Xe] 4f5 5d1 6s2
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Eu: [Xe] 4f6 5d1 6s2
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Gd: [Xe] 4f7 5d1 6s2
E
Correct answer
Explanation
Correct answer.
Electronic configuration of gadolinium (64Gd) is [Xe] 4f7 5d1 6s2.
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Only 1
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Only 1 and 2
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Only 1, 3 and 4
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Only 2 and 3
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Only 2 and 4
A
Correct answer
Explanation
Total number of orbitals in a shell with principal quantum number ‘n’ is n2.
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Only P and Q
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Only P and S
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Only Q and R
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Only Q and S
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Only R and S
E
Correct answer
Explanation
Palladium (46Pd): [Kr] 4d10 5s0
Cadmium (48Cd): [Kr] 4d10 5s2
Both Pd and Cd have completely filled 4d-orbital.
C
Correct answer
Explanation
Carborundum is the common name for silicon carbide (SiC). It is a hard compound used as an abrasive.
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isotones
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isobars
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isotopes
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mirror nuclei
A
Correct answer
Explanation
Isotones are atoms that have the same number of neutrons. For Si (30-14=16), P (31-15=16), and S (32-16=16), all have 16 neutrons.
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oxygen
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silicon
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carbon
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boron
C
Correct answer
Explanation
Carbon's ability to form stable covalent bonds with hydrogen and other carbon atoms allows it to form a vast array of hydrocarbons and organic compounds.
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Victor Goldschmidt
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Abney
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Achard
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Acheson
A
Correct answer
Explanation
Chalcophiles, lithophiles, siderophiles and atmophiles are classes of elements, based upon similar geochemical properties, and reactive affinities. The classes were originally advanced, by Swiss-born Victor Goldschmidt (1888-1947) and are terms still widely used by geologists and geochemists. The key factor in determining an element's class, is the type of chemical bonds that the element forms.
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Chalcophile
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Lithophiles
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Siderophiles
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Atmophiles
B
Correct answer
Explanation
Lithophiles have a high bonding affinity with oxygen. Lithophiles have an affinity to form ionic bonds and are represented by silicates (silicon and oxygen) in the crust and mantle. Other lithophile elements include magnesium, aluminum, sodium, potassium, iron and calcium.
B
Correct answer
Explanation
Sulphur is a non- metal used to prepare sulphur drugs and sulphur compounds like, sulphuric acid, sulphur dioxide matches, vulcanized rubber, dyes and gunpowder.
B
Correct answer
Explanation
Inner transition elements consist of the lanthanide series (14 elements) and the actinide series (14 elements), totaling 28 elements in the f-block of the periodic table.
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a compound
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an element
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a mixture
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None of the above
A
Correct answer
Explanation
In the first partition of Quick sort using 66 as the pivot, 66 is placed in its final sorted position.
D
Correct answer
Explanation
The f-subshell has 7 orbitals, and since each orbital can hold 2 electrons, the f-subshell can accommodate a maximum of 14 electrons.
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state
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electronic configuration
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size
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molecular size
B
Correct answer
Explanation
The chemical behavior of an element is primarily determined by the arrangement of its electrons in shells, specifically the valence electrons.
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Ruby
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Sapphire
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Emerald
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Diamond
D
Correct answer
Explanation
Diamond is an allotrope of carbon, which is a chemical element. Ruby, sapphire, and emerald are mineral varieties (compounds/mixtures).