Do you know !! What is resonance theory? Resonance Theory: According to resonance theory some molecules are represented by two or more than two structures and the actual structure is weighed average of these and is called resonance hybrid. There are certain molecules which cannot be represented by single structure, so we write various possible …
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Mole is a counting device or a number like: 12 things = Dozen 144 things = Gross 2 things = Pair 1000 g = 1k g similarly: 6.022 x 1023 particles =1 mole Mole Definition: In Chemistry , mole is defined as the amount of substance that exactly contains 6.022 x 1023 particles. . For …
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Chapter-Wise Multiple Choice Question with brief answers for Class 11 Chemistry: Chapter 1: Basic Concepts of Chemistry Important MCQs Chapter 2 :Structure of Atom Important MCQs (Part 1) Chapter 2 :Structure of Atom Important MCQs (Part 2) Chapter 3 Chemical Bonding Important MCQs (Part 1) Chapter 3 : Chemical Bonding MCQS ( Part 2) More …
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Group II-A Elements of periodic table Be (Beryllium) Mg (Magnesium) Ca (Calcium) Sr (Strontium) Ba (Barium) Ra (Radium) Alkaline earth metals are the most reactive metals in the periodic table after alkali metals (Group IA). Group II A elements having a valence shell configuration of ns2 (full filled orbitals). Alkaline earth metals (Group II A …
Group 1 Elements alkali Metals Occurrence, Physical and Chemical Properties, Reactivity and Compounds Group I-A Elements Elements of Group I-A are called alkali metals due to the alkaline nature of their oxides and hydroxides. Namely, Lithium (Li) , Sodium (Na) , Potassium (K), Rubidium (Rb) , Cesium (Cs) and Francium (Fr) are group 1A elements …
Anomalous Behavior of Lithium in its group: Lithium being 1st member of the group 1 with the symbol Li and atomic number 3 and electronic configuration of 1s2 2s1 shows some differences from the rest of the members of its group. (i) Melting and boiling point of Lithium are much higher than other members of its …
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Trends in Chemical properties of elements in period 3 : Period 3 of the table consists of Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Sulphur, Chlorine and Argon. They can be roughly divided into metals (Na, Mg and Al), metalloids (Si) and non-metals (P, S, Cl, and Ar), and therefore the elements within these groups tend to …
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Trend in Physical properties of Period 3 elements: Electronic configuration of period 3 elements: The 3rd shell starts from sodium and completes at argon. 11Na → 1s2, 2s2, 2p6, 3s1 = [Ne], 3s1 12Mg → 1s2, 2s2, 2p6, 3s2 = [Ne], 3s2 13Al → 1s2, 2s2, 2p6, 3s2, 3p1 = [Ne], 3s2, 3p1 14Si → 1s2, …
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The energy required to remove an electron from an atom or ion, or its propensity to give up an electron, is measured by the ionisation energy or ionisation potential in chemistry and physics. The ground state of a chemical species is often where electron loss occurs. Ionization energy, also called ionisation energy, is the measure …
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