Chemistry

The position of an element in the Periodic Table is determined by its atomic number, which is the number of protons in the nucleus of an atom. This number uniquely identifies each element and defines its place in the table.

The modern periodic table currently contains 118 confirmed elements, from Hydrogen (1) to Oganesson (118). This is the widely accepted and updated count in scientific literature.

Chromite is the primary ore of chromium, from which chromium metal is extracted. The other options are unrelated to chromium.

Fluorine is the most electronegative element in the periodic table due to its high effective nuclear charge and small atomic radius, which strongly attracts electrons. Oxygen and bromine are less electronegative, and sodium is a metal with low electronegativity.

Chromite is the primary ore of chromium, containing chromium oxide and iron oxide, making it the main source for extracting chromium metal. The other options are unrelated substances.

The modern periodic table currently contains 118 confirmed elements, from hydrogen (1) to oganesson (118). This is the widely accepted and standardized count in chemistry.

Gold and silver are both classified as coinage metals because they have historically been used to make coins. They are also considered noble metals due to their resistance to corrosion and oxidation. Therefore, both terms apply to these metals.

RDX is commonly known as Cyclonite, which is a powerful explosive compound. The other options do not correspond to RDX.

Bauxite is not a single chemical compound but a mixture of minerals primarily containing aluminium oxides and hydroxides such as gibbsite, boehmite, and diaspore. Therefore, it does not have a single chemical name like 'Aluminium Oxide'.

Copper (Cu) is a transition element because it is a d-block element with an incomplete d-subshell in its atoms or common oxidation states. Chlorine (Cl) and sulfur (S) are p-block elements and not transition metals. Therefore, option B is correct.