Flashcards for NEET Chemistry - The s-Block Elements

Flashcards for NEET Chemistry are designed to boost your NEET preparation. Find below flashcards for the chapter “The s-Block Elements ”. These flashcards are prepared as per the NEET syllabus. These are helpful for aspirants of NEET and other exams during last-minute revision. It covers all the important points that are frequently asked in the exam. Check BYJU’S for the full set of Flashcards and Study material for NEET Chemistry.

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The s-Block Elements

NEET Exams

flashcards for neet chemistry nov16 the s block elements 1
flashcards for neet chemistry nov16 the s block elements 2
flashcards for neet chemistry nov16 the s block elements 3
flashcards for neet chemistry nov16 the s block elements 4


The s-Block Elements

s-Block Group 1

Alkali Metals

Outer electronic configuration – ns1

Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Caesium (Cs) and Francium (Fr)

They are called alkali metals because their hydroxides are strongly alkaline

s-Block Group 2

Alkaline Earth Metals

Outer electronic configuration – ns2

Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba) and Radium (Ra)

They are called alkaline earth metals (exception Be), because their oxides are found in the earth’s crust and their oxides and hydroxides are alkaline.

Alkali Metals Reactivity

Highly reactive due to large size and low ionisation enthalpy

Reactivity increases down the group

Chemical Properties of Alkali Metals

They burn vigorously in oxygen forming oxides

React with water to form hydroxide and dihydrogen

They are strong reducing agents

Anomalous Behaviour of Lithium

It is due to the small size and high polarising power

In the air, it forms mainly monoxide, Li2O and the nitride, Li3N

Does not form ethynide

Shows diagonal relationship to magnesium

Important Compounds of Sodium

Washing soda – Sodium carbonate, Na2CO3·10H2O

Table salt – Sodium chloride, NaCl

Caustic Soda – Sodium hydroxide, NaOH

Baking Soda – Sodium Hydrogen carbonate, NaHCO3

Uses of Alkaline Earth Metals

Magnesium-aluminium alloys – Aircraft construction

Milk of magnesia (Suspension of Mg(OH)2 in water) – Antacid

Magnesium carbonate – Toothpaste

Calcium – Extraction of metals from oxides

Radium salts – Radiotherapy

Important Compounds of Calcium

Quick Lime – Calcium Oxide or CaO

Slaked lime – Calcium Hydroxide, Ca(OH)2

Plaster of Paris – Calcium Sulphate, CaSO4·1⁄2 H2O

Gypsum – CaSO4·2H2O

Portland Cement

Dicalcium silicate (Ca2SiO4) – 26%

Tricalcium silicate (Ca3SiO5) – 51%

Tricalcium aluminate (Ca3Al2O6) – 11%

Castner-Kellner Process

Preparation of sodium hydroxide (alkali hydroxide) by the electrolysis of sodium chloride (alkali chloride)

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