The question asks to identify the specific law formulated by Dmitri Mendeléev that states the properties of elements are a periodic function of their atomic masses. This requires knowledge of the historical development of the periodic table.
Correct Option: B) Periodic law
Mendeléev's statement, "The properties of elements are the periodic function of their atomic masses," is the definition of his Periodic Law. This law was foundational to the development of the periodic table and allowed for the prediction of undiscovered elements.
The question asks to identify the term used for the vertical columns in Mendeléev's Periodic Table. This is a fundamental concept in the history and structure of the periodic table.
Correct Option: C) Groups — In Mendeléev's Periodic Table, the vertical columns are indeed called Groups. Elements within the same group exhibit similar chemical properties.
The question asks to identify the term used for the horizontal rows in Mendeléev's Periodic Table. This is a direct recall question from the topic of the periodic classification of elements.
Correct Option: D) Periods
The question asks which element's electronic configuration resembles that of alkali metals. We need to recall the general electronic configuration of alkali metals and then compare it with the electronic configurations of the given options.
Alkali metals have one electron in their outermost s-orbital (\(ns^1\)).
Therefore, Hydrogen's electronic configuration \(1s^1\) resembles the general electronic configuration \(ns^1\) of alkali metals, as it also has one electron in its outermost shell.
A) Hydrogen has an electronic configuration of \(1s^1\). This configuration, with one electron in its outermost shell, is similar to the general electronic configuration \(ns^1\) of alkali metals. This similarity leads to hydrogen exhibiting some properties similar to alkali metals, such as forming a positive ion (\(\text{H}^+\)) by losing its single electron.
The question asks about the molecular form of hydrogen, drawing a parallel with halogens. We need to recall the common molecular structure of hydrogen and halogens in their elemental state.
Correct Option: B) Diatomic
Statement 1: Certainly, no fixed position can be given to hydrogen in the Periodic Table.
Statement 2: This was the first limitation of Mendeléev’s Periodic Table. He could not assign a correct position to hydrogen in his Table.
Statement 1 is true, Statement 2 is true. Statement 2 doesn't explain Statement 1
Statement 1 is true, Statement 2 is true. Statement 2 explains Statement 1
Statement 1 is false, Statement 2 is true.
Statement 1 is true, Statement 2 is false
The question asks us to evaluate two statements regarding the position of hydrogen in the Periodic Table, specifically in the context of Mendeleev's Periodic Table. We need to determine if both statements are true and if Statement 2 correctly explains Statement 1.
B) Statement 1 is true, Statement 2 is true. Statement 2 explains Statement 1. Both statements are factually correct, and the second statement directly addresses a historical consequence of the ambiguity described in the first statement.