ANSWER: Mono-Isotopic Elements: “The elements having only a single isotope are called mono-isotopic elements.” Examples: Gold, Iodine, arsenic, Fluorine, etc. (Ref. An Insight Into Objective Chemsitry-11, Ch-01, Q. No. 18)
ANSWER: Chemical properties depend upon atomic number, i.e., the number of protons or the number of electrons and their arrangement in valence shells. Since, isotopes have same atomic number, they have same chemical properties. Physical properties depend upon atomic masses…
ANSWER: Isotopes & Isotopy: “The atoms of the same element having same atomic number but different atomic masses are called isotopes, and the phenomenon is termed as isotopy, first discovered by Soddy.” Isotopes possess same chemical properties and same position…
ANSWER: Atomic Mass Unit (amu): “The unit used to express the relative atomic mass is called atomic mass unit (amu). It is 1/12th of the mass of one carbon atom.” On C–12 scale, the relative atomic mass of 6C12 is…
ANSWER: Relative Atomic Mass: “Relative atomic mass is the mass of an atom of an element as compared to the mass of an atom of carbon taken as 12.” We use the term relative atomic mass because the given masses…
ANSWER: ION MOLECULAR ION 1) “Those species which carry either positive or negative charge are called ions.” 2) Anions having group of atoms are more abundant than cations.3) Examples: K+, Mg2+, Al3+, O2–, CO32– etc. 1) “When a molecule loses…
ANSWER: MOLECULAR IONS: “When a molecule loses or gains an electron, it forms a molecular ion.” Formation of Molecular Ions: Molecular ions can be generated by passing high-energy electron beams or α-particles or X–rays through a substance present in gaseous…
ANSWER: The formation of a uninegative ion is an exothermic reaction. This is because energy is released when an extra electron enters a neutral atom and is attracted by its nucleus. B + e– ⟶ B– ∆H = Negative (Ref.…
ANSWER: The formation of a positive ion is always an endothermic reaction. The reason is that positive ion is formed by the removal of one or more electrons from the neutral atom. Since, electrons are strongly held by the nucleus,…
ANSWER: IONS: “Those species which carry either positive or negative charge are called ions.” Examples: K+, Mg2+, Al3+, Cl–, O2–, CO32– etc. Conditions for the Formation of Ions: 1) Positive ions or cations are produced when an atom loses one…