Question

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is $ 1{{s}^{2}}2{{s}^{2}}2{{p}^{3}} $ , the simplest formula for this compound is
(1) $ M{{g}_{2}}{{X}_{3}}~ $
(2) $ Mg{{X}_{2~}} $
(3) $ M{{g}_{2}}X $
(4) $ Mg{{X}_{2}} $

Answer 1

Hint: Magnesium (Mg) is a chemical element with the atomic number 12 and the symbol Mg. It's a gleaming grey solid that looks a lot like the other five elements in the second column of the periodic table (group 2, or alkaline earth metals): they all have the same electron configuration in the outer electron shell and a similar crystal structure.

Complete answer:
Magnesium is only found in nature in conjunction with other elements, and it always has a +2 oxidation state. The free element (metal) may be synthesised chemically and is extremely reactive (albeit it is covered in a thin layer of oxide in the environment, which somewhat limits reactivity - see passivation). The liberated metal emits a distinctive brilliant-white light. The metal is presently largely produced by electrolysis of magnesium salts extracted from brine and is mostly utilised as a component in aluminum-magnesium alloys, sometimes known as magnalium or magnesium. Magnesium has a lower density than aluminium, making it a desirable alloy for its lightness and strength. Because the $ M{{g}^{2+}} $ cation is the second most common cation in saltwater and sea salt are appealing commercial sources of Mg. Calcium hydroxide is added to seawater to create magnesium hydroxide precipitate, which is then extracted.
Magnesium is an alkaline earth metal that takes the form of the ion $ M{{g}^{2+}} $
The element X has $ 1{{s}^{2}}2{{s}^{2}}2{{p}^{3}} $ electronic ground state configuration will produce the letter $ {{X}^{-3}} $ ion.
When 3 $ M{{g}^{2+}} $ is added with $ 2{{X}^{-3}} $ , the charges on the cation and anion will be balanced.
As a result, C is the right answer.

Note:
Following iron and aluminium, magnesium is the third most widely utilised structural metal. Aluminium alloys, die-casting (alloyed with zinc), eliminating sulphur in the manufacture of iron and steel, and the creation of titanium in the Kroll process are the primary uses of magnesium. Magnesium is included in lightweight alloys and materials. It possesses exceptionally high specific strength when injected with silicon carbide nanoparticles, for example.