Periodic Classification Of Elements — Part 1 MCQs with Explanations

Definition: Transition elements are elements found in the d-block of the periodic table, where the d-orbitals are progressively filled. Electronic configuration: In transition elements, the outermost shell (ns) and the penultimate shell (n-1)d are both incomplete. This is why they are said to have two incomplete outermost shells . Reason: The incomplete (n-1)d subshell gives rise to many characteristic properties of transition metals such as variable oxidation states, formation of coloured compounds, and catalytic activity. Why other options are incorrect: Option A is incorrect because three incomplete shells occur in inner transition elements, not regular transition elements. Option B is incorrect because it ignores the incompleteness of the (n-1)d subshell. Option D is incorrect because transition metals do not have eight electrons in their outermost shell. Conclusion: The most appropriate statement for transition elements is that two of their outermost shells are incomplete .

Electron affinity refers to the amount of energy released when an electron is added to a neutral atom to form a negative ion. Among the options provided, fluorine (F) has the highest electron affinity. Fluorine has the smallest atomic size among the options, resulting in a higher effective nuclear charge and thus a stronger attraction for an additional electron, leading to the highest electron affinity among the given elements. Option A: I Iodine (I) has a relatively low electron affinity compared to other halogens. While iodine does have a notable electron affinity, it is lower than the other options provided. Therefore, iodine does not have the largest electron affinity among the options. Option B: Br Bromine (Br) has a higher electron affinity than iodine but is still lower than fluorine and chlorine. Bromine is larger in size compared to fluorine and chlorine, resulting in a weaker attraction for additional electrons. Therefore, bromine does not have the largest electron affinity among the options. Option C: F Fluorine (F) has the highest electron affinity among the options provided. Fluorine is the smallest halogen with the highest effective nuclear charge, resulting in the strongest attraction for an additional electron. Thus, fluorine has the largest electron affinity among the given elements. Option D: Cl Chlorine (Cl) has a higher electron affinity than bromine and iodine but is still lower than fluorine. Chlorine is smaller than bromine and iodine but larger than fluorine, leading to a moderate attraction for additional electrons. Therefore, chlorine does not have the largest electron affinity among the options provided.

Alexander Newlands is the correct answer to “The law of Octaves' was proposed by:”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Both A and B is the correct answer to “Periodic classification of elements can be done on the basis of electronic configuration and is used to examine the”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

third is the correct answer to “Which of the following resembles the 10 th element in Newland's periodic classification”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

law of Triads is the correct answer to “Johann Dobereiner gave the idea of trends among physical and chemical properties of several groups of three elements, the relationship referred to as”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

atomic weight is the correct answer to “Chemical properties of elements, according to Lothar Meyer, is the periodic function of their”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Octaves law of Newlands is the correct answer to “Iron that resembles cobalt and nickel in properties has been kept far away from these elements. Which was one of its shortcomings-”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

fluorine, chlorine and bromine is the correct answer to “In Mendeleev's periodic table, iodine with lower atomic weight than that of tellurium was placed alongwith”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

18 is the correct answer to “How many elements are there in the 5 th Period of Modern Periodic Table”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Periodic Table of Contents is the correct answer to “Scientists named Newlands, Mendeleev and Mayer developed . . . . . . . .”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Fe is the correct answer to “According to Newlands rule of octaves, . . . . . . . . which resembles cobalt and nickel in properties, is kept far away from these elements.”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Pyruvic acid is the correct answer to “Glucose molecule breaks down into . . . . . . . .”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Li is the correct answer to “. . . . . . . . is the largest atom in these elements”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Al & P is the correct answer to “In modern periodic tables silicon (Z = 14) are placed between . . . . . . . . and . . . . . . . .”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Periodic table of chemical elements is the correct answer to “What did Dmitry Mendeleev prepare”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Be (4) is the correct answer to “If an element has an atomic number of 20, its chemical properties will be similar to which of the following elements”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

3 is the correct answer to “If the electronic configuration of an element is 2, 8, 2, then which period of modern periodic table will it belong to”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

a-2, b-4, c-1, d-3 is the correct answer to “Match List I with List II List-I List-II a. Modern Periodic Law 1. Groups b. Father of Periodic Table 2. Moseley c. Vertical lines in Modern Periodic Table 3. Periods d. Horizontal lines in Modern Periodic Table 4. Mendeleef”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Calcium is the correct answer to “. . . . . . . . is the element present in the fourth period and the second group.”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

aluminium is the correct answer to “The element X forms an oxide, whose formula is X 2 O 3 , the element X is more likely to have the same group in the periodic table as . . . . . . . .”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

1864 is the correct answer to “In . . . . . . . . Newlands arranged the known elements according to the increasing order of atomic masses and found that the properties of each eighth element are similar to the properties of the first element.”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Valency is the correct answer to “Which of the following does not increase in going from top to the bottom in a group”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

inert gases is the correct answer to “In the modern periodic table, what are the basic elements of group 18 (all other than having eight electrons in their outermost shell)”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Li, Na, K is the correct answer to “Which one of the following triads represents the Dobereiner triad”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

atomic size is the correct answer to “A factor affecting the ionization potential of an element is . . . . . . . .”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Only 2 is the correct answer to “Consider the following statements with reference to the Periodic Table of chemical element 1. Ionisation potential gradually decreases along a period. 2. In a group of element, electron affinity decreases as the atomic weight increases. 3. In a given period, electronegativity decrease as the atomic number increases. Which of these statement(s) is/are correct”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Henry Mojle is the correct answer to “. . . . . . . . shows that the atomic number of an element is more fundamental than its atomic mass”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Mendeleev is the correct answer to “Name the Russian chemist who proposed that the properties of elements are a periodic function of their atomic masses”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Na > Mg > Al > Si > Cl is the correct answer to “Select the option to be obtained by placing the following elements in descending order based on their metallic characteristics. Na, Si, Cl, Mg, Al”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Calcium is the correct answer to “Newlands' octave rule applies only to . . . . . . . . element.”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

tungsten is the correct answer to “Which element has the highest melting point and boiling point”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Li-Mg is the correct answer to “Which among the following has similar ionic charge to size ratio”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Kr is the correct answer to “Which of the following inert gas is kept in period 4 of the periodic table”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

p-block is the correct answer to “Out of the four blocks in which periodic table is divided, helium belongs which block”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Argon is the correct answer to “Which among the following has lowest electron affinity”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Internal transition element is the correct answer to “Lanthanides and actinides are also called . . . . . . . .”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

first period is the correct answer to “Hydrogen and helium Is placed in . . . . . . . .”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Group 18 is the correct answer to “Which group in the periodic table is also known as zero group (group 0)”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.

Triad (Trik) is the correct answer to “What did Dobereiner identify and name a group of three elements”. This question is standard in competitive examination syllabi for Periodic Classification Of Elements.