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Chemistry · Classification of Elements and Periodicity in Properties
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Chemistry · Classification of Elements and Periodicity in Properties
Which electronic configuration corresponds to the outermost shell of f-inner transition elements (specifically Lanhanoids and Actinoids)?
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Match List-I with List-II: List-I List-II A \( \text{Na}_2\text{O} \) with water I Forms a strong base \( 2\text{NaOH} \) B \( \text{Cl}_2\text{O}_7 \) with water II Forms a strong acid \( 2\text{HClO}_4 \) C Maximum covalency of Boron III Equal to \( 4 \) due to absence of \( d \)-orbitals D Oxidation state of Al in \( [\text{AlCl}(\text{H}_2\text{O})_5]^{2+} \) IV Equal to \( +3 \) while its covalency is \( 6 \) Choose the correct answer from the options given below:
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Given below are two statements: Statement I: Lothar Meyer plotted physical properties such as atomic volume, melting point and boiling point against atomic weight and obtained a periodically repeated pattern. Statement II: In IUPAC nomenclature, the symbol for the digit 0 is 'n' and name root is 'nil'. In the light of the above statements, choose the most appropriate answer from the options given below:
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What is the formula of the compound formed between aluminium and sulphur?
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According to the IUPAC nomenclature system for elements with atomic number above 100, what is the numerical root for the digit 7 and its abbreviation?
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According to Pauling scale, what is the electronegativity value assigned to fluorine?
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What is the IUPAC symbol for the element having the systematic name 'Ununennium' (Atomic number 119)?
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According to Dobereiner's triads, if the atomic weights of the first and third elements of a triad are \( 7 \) and \( 39 \) respectively, calculate the atomic weight of the middle element.
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Match List-I with List-II: List-I List-II A Shielding effect of inner electrons I Increases across a period B Effective nuclear charge (\( Z_{\text{eff}} \)) II Decreases down a group C Atomic radius III Reduces the actual nuclear charge experienced by valence electrons D First ionization enthalpy IV Generally increases across a period Choose the correct answer from the options given below:
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The first ionization enthalpy of boron (\( Z = 5 \)) is slightly less than that of beryllium (\( Z = 4 \)). Which formula/expression correctly reflects the electronic configuration difference responsible for this anomaly during ionization?
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Using Pauling scale electronegativity values from Table 3.8(a), calculate the electronegativity difference \( \Delta \chi = |\chi_{\text{F}} - \chi_{\text{Li}}| \) between Fluorine and Lithium in Period II. Which of the above statements is/are correct?
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Which of the following species has the largest size and which has the smallest size among \( \text{Mg}, \text{Mg}^{2+}, \text{Al}, \text{Al}^{3+} \)?
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What is the general outer electronic configuration of the f-block elements (inner-transition elements)?
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What is the reaction of \( \text{Na}_2\text{O} \) with water?
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Which of the following pairs of elements exhibits a diagonal relationship due to similar ionic radii and charge-to-radius ratios?
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Identify the transition metal that has the outermost electronic configuration \( (n-1)d^{10}ns^2 \) and does not show most of the typical properties of transition elements like catalytic activity or colored ion formation.
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Mendeleev left certain gaps under aluminum and silicon in his periodic table. Reason (R): Mendeleev predicted the existence of gallium and germanium before their discovery and described some of their general physical properties. In the light of the above statements, choose the correct answer from the options given below:
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Consider the following statements regarding periodic trends: (A) The first ionization enthalpy of oxygen is smaller than that of nitrogen due to inter-electron repulsion arising from pairing in \( 2p \)-orbitals. (B) Noble gases have large positive electron gain enthalpies. (C) Electronegativity is a measurable physical quantity. (D) The maximum covalency of boron is 4. Which of the above statements are correct?
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Mendeleev predicted the existence of certain undiscovered elements and left gaps in his periodic table. For Eka-aluminium, which was later discovered as Gallium, what was the predicted atomic weight?
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The long form of the periodic table contains 7 horizontal rows called periods. Reason (R): Each period in the periodic table starts with a noble gas and ends with an alkali metal. In the light of the above statements, choose the correct answer from the options given below:
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According to Mendeleev's predictions for Eka-aluminium and Gallium, what was the experimentally found density of Gallium (in \( \mathrm{g/cm^3} \))?
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Boron has a smaller first ionization enthalpy than beryllium. Reason (R): The penetration of a \( 2s \)-electron to the nucleus is more than that of a \( 2p \)-electron, making the \( 2p \)-electron of boron more shielded from the inner core than the \( 2s \)-electron of beryllium. In the light of the above statements, choose the correct answer from the options given below:
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