This similarity in properties of elements placed diagonally to each other is called diagonal relationship. For example, noble gas elements have positive electron gain enthalpies. – These are the elements present in group 18. (iii) Metal usually have high melting and boiling points. Chapter Wise CBSE Quick Revision Notes and Key Points for Class 11 Physics Notes Pdf free download was designed by expert teachers from the latest edition of NCERT books to get good marks in board exams. Its direction is not defined. (a) Covalent radius (b) Ionic Radius (c) van der Waals radius (d) Metallic radius. (i) This made the study of the elements quite systematic in the sense that if the properties of one element in a particular group are known, those of others can be pridicted. (ii) Right Hand Thumb Rule Curl the fingers of your right hand from A to B. Below we are providing an overview of each chapter that is available in NCERT textbook for physics. The process is represented as: • Electronegativity (ii) Although the elements in the Mendeleev’s periodic table have been arranged in order of their atomic masses, but in some cases the element with higher atomic mass precedes the element with lower atomic mass. Home ; Grade 11 ; Physics; Back to subjects This is a basic chapter that clears your doubts about units, derived units, base units, a system of units, and much more. Atomic Radii: It is defined as the distance from the centre of the nucleus to the outermost shell containing the electrons. • Nomenclature of Elements with Atomic No. Students can visit each and every subtopic by clicking the links provided and can learn in detail about all the concepts covered in Class 11 Physics. Khan Academy is a 501(c)(3) nonprofit organization. JEE NEET Study Material : Notes , Assignment. Important questions for class 11 Physics Important questions for Class 11th Physics provides you strategies to prepare you for class 11th Physics examination. • Present Form of the Periodic Table (Long form of Periodic Table) • Periodic Trends in Chemical Properties along a Period General electronic configuration: (n – 2) f1-14 (n -1) d0-1 ns2 Elements which line as the border line between metals and non-metals (e.g., Si, Ge, As) are called metalloids or semimetals. Chemistry Notes , Chemistry Assignment , Chemistry Quiz , … (i) Vector product is not commutative, i.e.. (ii) Vector product is distributive, i.e.. (iii) Vector product of two parallel vectors is zero, i.e.. (iv) Vector product of any vector with itself is zero. Class 11 Chemistry Notes – Free PDF Download Chapter wise. Along a period ionization enthalpies are expected to increase in moving across from left to the right, because the nuclear charge increases and the atomic size decreases. How does fluid differ from solids? After the addition of one electron, the atom becomes negatively charged and the second electron is to be added to a negatively charged ion. (i) In the periodic table, the elements are arranged in vertical rows called groups and horizontal rows known as periods. This chapter will help you in understanding the favor of gases along with fast-moving molecules and atoms. Required fields are marked *. (iv) The non-metallic character increases as one goes from left to right across the Periodic The direction of unit vector n can be obtained from right hand thumb rule. (From left to right). • Non-metals For example, when an electron is added to oxygen atom to form O– ion, energy is released. Electron gain ethalpy becomes more negative with increase in the atomic number across a period. This chapter introduces the students to the world of kinematics. Cation: The removal of an electron from an atom results in the formation of a cation. (iv) The physical properties of the elements such as m.p., b.p. This is considered as a macroscopic science. (i) In all the elements present in a period, the electrons are filled in the same valence shell. In contrast, noble gases have large positive electron gain enthalpies because the extra electron has to be placed in the next higher principal quantum energy level thereby producing highly unstable electronic configuration. They are elements of s-block and p-block. • Modem Periodic Law. (xi) Position Vector A vector representing the straight line distance and the direction of any point or object with respect to the origin, is called position vector. NCERT Solutions for Class 11 Chemistry: Chapter 3 (Classification of Elements and Periodicity in Properties) are provided on this page for the perusal of CBSE Class 11 students. • Non-metals. Across a Period (ii) Non-metals are usually solids or gases at low temperature with low melting and boiling points. Their radii would be different because of their different nuclear charges. Mendeleev arranged the elements known at that time in order of increasing atomic masses Newlands called it law of octaves because similar relationship exists in the musical notes also. For example, Thus, it gives students an opportunity to choose on their own which topics they should prepare well. The elements after uranium are also called transuranic elements. (iv) The reactivity of elements in a group generally decreases downwards. Furthermore, students will also learn about the reference point, and the frame of reference, the magnitude of displacement, path length, instantaneous velocity, relative velocity, retardation, acceleration, etc. Thus the second electron gain enthalpy of an element is positive. The unit of ionization enthalpy is kJ mol-1 and the unit of ionization potential is electron volt per atom. General electronic configuration: ns1-2 Characteristics of s-block elements: • Chemical Reactivity. Chemical reactivity is highest at the two extremess of a period and lowest in the centre. Table. Resolution of a Vector into Rectangular Components, If any vector A subtends an angle θ with x-axis, then its, If any vector A subtend angles α, β and γ with x – axis, y – axis and z – axis respectively and its components along these axes are Ax, Ay and Az, then, cos α= Ax / A, cos β = Ay / A, cos γ = Az / A, Subtraction of a vector B from a vector A is defined as the addition of vector -B (negative of vector B) to vector A. Generally increases down a group. As electronegativity of elements decreases from top to bottom in a group. CBSE Class 12 Chemistry , CBSE Class 12 Physics. Unlike ionization enthalpy and electron gain enthalpy, it is not a measurable quantity. (iii) In moving from left to right in a period, the non-metallic character of the elements increases. The direction is determined by the right hand screw rule and right hand thumb rule.
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