OnlineCBT
Chemistry · Classification of Elements and Periodicity in Properties
Practice questions & answers
Find a question, read its answer and explanation, then practise related questions.
Chemistry Classification of Elements and Periodicity in Properties · Clear filters
91 questions
Chemistry · Classification of Elements and Periodicity in Properties
Given below are two statements: Statement I: The first period of the modern periodic table contains 8 elements. Statement II: The seventh period of the periodic table is complete and contains 32 elements. In the light of the above statements, choose the most appropriate answer from the options given below:
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
How many elements are present in the sixth period of the modern periodic table?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
In Newlands' Law of Octaves, the properties of every eighth element were similar to those of the first element. Starting from Lithium (\( \text{Li} \)), which element exhibits similar properties based on this classification up to calcium?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Consider the following atomic radii values (in pm) for Period 3 elements from Table 3.6(a): Na = 186, Mg = 160, Al = 143, Si = 117, P = 110, S = 104, Cl = 99. Based on these periodic trends, what is the primary factor responsible for the sharp decrease in atomic size from Sodium (\( 186\text{ pm} \)) to Chlorine (\( 99\text{ pm} \))?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Consider the following statements regarding transition and inner-transition series: (A) The d-block elements form a bridge between the chemically active metals of s-block and less active elements of Groups 13 and 14. (B) Zn, Cd and Hg have electronic configuration (n-1)d^10ns^2 and do not show most of the characteristic properties of transition elements. (C) The inner-transition elements are characterized by the filling of f-orbitals belonging to (n-2) energy level. (D) All lanthanoids and actinoids are man-made radioactive elements. Which of the above statements are correct?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
In the modern periodic table, the groups are numbered from 1 to 18 according to the recommendation of:
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Match List-I with List-II: List-I List-II A \( \text{f} \)-Block Elements I Outer electronic configuration \( (\text{n}-2)\text{f}^{1-14}(\text{n}-1)\text{d}^{0-1}\text{ns}^2 \) B \( \text{d} \)-Block Elements II Outer electronic configuration \( (\text{n}-1)\text{d}^{1-10}\text{ns}^{0-2} \) C Representative Elements III Outer electronic configuration \( \text{ns}^1\text{--}\text{ns}^2\text{np}^6 \) D Inner-Transition Series IV Lanthanoids and Actinoids Choose the correct answer from the options given below:
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
According to IUPAC nomenclature of elements, what is the root and abbreviation for the digit 7?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Henry Moseley observed regularities in the characteristic X-ray spectra of elements. A plot of \( \sqrt{\nu} \) (where \( \nu \) is frequency) against which parameter gave a straight line?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Based on the periodic trends in atomic and ionic radii from the table on page 5, what is the metallic radius difference \( \Delta r = r(\text{Na}) - r(\text{Li}) \) in pm?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
According to the IUPAC recommendations, the groups in the modern periodic table are numbered from 1 to 18, replacing the older notation. What was the older notation corresponding to Group 17?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Match List-I with List-II: List-I (Block/Series) List-II (General Configuration / Position) A s-Block elements I \( ns^1 \) to \( ns^2 \) B p-Block elements II \( ns^2 np^1 \) to \( ns^2 np^6 \) C d-Block elements III \( (n-1)d^{1-10}ns^{0-2} \) D f-Block elements IV \( (n-2)f^{1-14}(n-1)d^{0-1}ns^2 \) Choose the correct answer from the options given below:
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Which of the following elements belongs to the 3d transition series?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Which element shows diagonal relationship with magnesium in the periodic table?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Which of the following elements has the most negative electron gain enthalpy?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
What is the oxidation state and covalency of aluminium in \( [\text{AlCl}(\text{H}_2\text{O})_5]^{2+} \)?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Match List-I with List-II: List-I List-II A Halogens I Group 16 B Chalcogens II Group 17 C Alkali Metals III Group 1 D Alkaline Earth Metals IV Group 2 Choose the correct answer from the options given below:
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
What is the official IUPAC name for the element with atomic number \( Z = 104 \)?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Consider the elements with atomic numbers 58 to 71. These elements belong to which specific series of the periodic table, and what is their general outermost electronic configuration?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The atomic number of an element is a more fundamental property than its atomic mass. Reason (R): Moseley showed that a plot of \( \sqrt{\nu} \) of characteristic X-rays emitted from an element against atomic number gives a straight line, whereas atomic mass does not give such a simple linear correlation. In the light of the above statements, choose the correct answer from the options given below:
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Elements in the same vertical column or group have similar outer electronic configurations. Reason (R): Elements having similar outer electronic configurations in their atoms are arranged in vertical columns referred to as groups or families. In the light of the above statements, choose the correct answer from the options given below:
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Consider the following statements regarding periodic properties and electronic configurations: (A) The atomic radius generally decreases across a period due to an increase in effective nuclear charge. (B) Within a group, atomic radius increases regularly with atomic number because the principal quantum number (n) increases. (C) Cations are always larger than their parent atoms due to increased electron-electron repulsion. (D) The first ionization enthalpy generally increases as we go across a period and decreases down a group. Which of the above statements are correct?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
