The question asks about the initial classification of elements in the periodic table. This refers to the fundamental and broadest categories used to group elements based on their general properties.
Correct Option: C) Metals and Non-Metals
The question asks to identify the term for elements that exhibit properties intermediate to metals and non-metals. This requires knowledge of basic classification of elements in chemistry.
A) Metalloids. Metalloids are elements that possess properties intermediate between those of metals and non-metals. Examples include Boron (B), Silicon (Si), Germanium (Ge), Arsenic (As), Antimony (Sb), Tellurium (Te), and Polonium (Po).
The question asks to identify the scientist who proposed the Law of Octaves. This requires knowledge of the historical development of the periodic classification of elements.
C) Newland - John Newlands proposed the Law of Octaves in 1865. He arranged the then-known elements in increasing order of their atomic weights and observed that every eighth element had properties similar to the first, comparing this pattern to the octaves in music.
To answer this question, we need to recall the chemical symbols for the given elements: Potassium, Gold, Aluminum, and Magnesium. Each element has a unique one- or two-letter symbol derived from its name (often Latin or Greek).
Combining these matches, we get: a-1, b-2, c-3, d-4.
Correct Option: A) a-1,b-2,c-3,d-4
The question asks for the specific property of metals that allows them to be hammered or pressed into thin sheets. This is a fundamental property of materials, particularly metals, and is related to their ability to undergo plastic deformation without fracturing.
Correct Option: B) Malleability is the property of metals that allows them to be beaten or rolled into thin sheets without breaking. This is due to the metallic bonding structure, where layers of atoms can slide past each other without disrupting the overall structure.
The question asks for the specific property of metals that allows them to be drawn into wires. This requires knowledge of the definitions of various material properties.
A) Ductility is the property of a material that allows it to be drawn into thin wires under tensile stress. Metals like copper, gold, and silver are highly ductile, which is why they are commonly used for making electrical wires and jewelry.