Download Ppt On Periodic Table Class 10
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When it comes to rationalising the periodic table, NCERT said that the discussion about the basic concepts such as elements, symbols, formation of compounds, atoms and molecules have been dealt with in Class 9. In Class 10, chemical reaction, acids, bases and salts, metals and non-metals, carbon and its compounds have been covered, it added.
Besides, it added, that during the COVID-19 pandemic, NCERT sought to rationalise the contents of the textbooks as learning was managed using alternative modes. It rationalised the contents based on the certain criteria including overlapping of similar content, similar content used in lower or higher class, high difficulty level, content that can be self-learnt or peer-learnt without much intervention from teachers, content that is not relevant in present context or is outdated, learning outcomes already taken care of in this rationalisation exercise.
In their latest clarification NCERT for its syllabus change has said that periodic table and evolution have not been removed from the school education curriculum but in fact are available in appropriate detail for students who opt for science in classes 11 and 12.
"Students pursuing science in classes 11 and 12 will study the details of Periodic Classification of elements (Periodic table). The content placed in the periodic table again have been made more age appropriate, more so considering the Covid pandemic situation," the official clarification from NCERT read.
According to an NDTV report, NCERT said that the discussion about basic concepts such as elements, symbols, formation of compounds, atoms and molecules have been dealt with in class 9. In class 10, chemical reaction; acids, bases and salts; metals and non-metals; carbon and its compounds have been covered.
"In this background, NCERT has undertaken the exercise to rationalise the textbooks across all classes. Learning Outcomes already developed by the NCERT across classes have been taken into consideration in this exercise," it said.
Education Collections allow us to curate the most relevant online resources related to specific NOVA programs. Use this collection of resources as a source of inspiration for your classroom: find a video clip to start a discussion with your students, incorporate an activity or demonstration into your class, or get some ideas about how these resources can be strung together with our example lesson plan.
Images Murray Robertson 1999-2011
Text The Royal Society of Chemistry 1999-2011
Welcome to "A Visual Interpretation of The Table of Elements", the most striking version of the periodic table on the web. This Site has been carefully prepared for your visit, and we ask you to honour and agree to the following terms and conditions when using this Site.
In this tutorial, you will learn how to read the periodic table. We will take a close look at the groups of the periodic table. In addition, you will learn about the different properties of the periodic table groups, periods, and families. If you enjoy this article, be sure to check out our others!
We think our periodic table is one of the best in the world! Visit our new interactive periodic table. You can view all sorts of trends, properties, magnetism, electrons, and even articles on all the elements!
So what is a period on the periodic table? Periods are the horizontal rows of the periodic table. There are seven periods total and each element in a period has the same number of atomic orbitals. The top period, which contains hydrogen and helium, has only two orbitals. As you go down the rows, the number of orbitals increases. Below is a table to help visuals the periodic number and the corresponding orbitals.
The number of valence electrons present dictates the properties of an element. The reason for this is that the valence electrons, which are the electrons in the outermost shell, are the ones taking part in chemical reactions. These electrons are either donating, accepting, or sharing. Moreover, the more filled the valence shell is, the more stable the element.
The first group is the least stable as it only has one valence electron. Meanwhile, group eighteen is the most stable as these elements have a full valence shell (eight valence electrons). Below is a table relating the group numbers to the number of valence electrons.
On the periodic table, there are families which are groups of elements with similar properties. These families are alkali metals, alkaline earth metals, transition metals, post-transition metals, metalloids, halogens, noble metals, and noble gases. Many of these families belong to a single group on the periodic table. However, not all of the families overlap with periodic table groups. For example, the transition metals contain all elements from group three to group twelve. Below is a periodic table where displaying the location of each family. You can also get a tutor to learn more about the table and see examples of several real elements.
The alkaline earth metals are the second most reactive family on the periodic table (following behind the alkali metals). Moreover, they are strong reducing agents which means they donate electrons in chemical reactions. They are also good thermal and electrical conductors. Physically, they have low density, low melting point, and a low boiling point.
The noble gases, also called aerogens, are inert gases. Some examples include argon, krypton, and neon. They can be found in group eighteen on the periodic table. Likewise, this means they have a complete valence shell. For this reason, they are stable and relatively unreactive. Furthermore, the noble gases have low boiling points and low melting points. Physically they are colorless and have no smell.
Chemists will often begin by making observations, then looking for patterns. They will use the periodic table to help as it is central to our understanding and classification of the world around us. It orders and classifies all the elements according to their physical and chemical properties.
Analogies are a powerful way to help students understand the complexities of chemistry. We can use different classification systems from everyday life to help students understand how the periodic table classifies elements.
Introduce students to a range of different elements in the table by asking them to classify them as metals or non-metals. Then ask them to find the symbol on the periodic table. After repeating this with a number of elements, they will soon start to build up a picture and discover that metals are on the left-hand side of the table and the non-metals on the right.
Provide students with a blank periodic table. As keywords, ideas and elements are met each lesson, students add them into their table. Over time, this will help them build up their own picture of the periodic table, which emphasises the key points.
Now take a look at a group of metals or non-metals such as the alkali metals or halogens. Demonstrate how the properties change as you go down the group. This can be done by looking up data such as melting points, and density and/or with practical demonstrations. Encourage students to look for patterns in reactivity and compare this reactivity to the position of the element in the periodic table.
A common misconception is that all the elements are arranged on the modern periodic table by increasing atomic weight. While this was the starting point for many developers of periodic tables, closer inspection shows notable exceptions . The modern periodic table has elements arranged in order of atomic number, which is the number of protons in an atom whereas the atomic mass is based on the entire mass of the atom. To help overcome this alternative theory, encourage your students to look closely at the table and discover for themselves how the numbers increase. Emphasise that they should use the key to distinguish the relative atomic mass from the atomic number.
The position of hydrogen can often lead to confusion as different versions of the periodic table place it differently: at the top of group 1 or 7 or somewhere in between. The point to emphasis here is that hydrogen is an anomaly. It is a non-metal with an electronic structure similar to group 1 metals. Therefore chemists sometimes struggle to know where to place it.
As students progress in their studies, they will be expected to describe the steps in the development of the periodic table. They will need to be able to explain how the position of an element in the periodic table is related to the arrangement of electrons in its atoms and hence to its atomic number. As well as, they should be able to explain the differences between metals and non-metals on the basis of their characteristic physical and chemical properties. From the position of elements in the table, they will need to be able to predict possible reactions and probable reactivity. They will be expected to explain how and why the reactivity of a group of element changes as you go down the group.
Considering how many classrooms and labs have supersized periodic tables on the wall, making students memorize the details seems like a waste of brain space that could be used for other tasks, like understanding how to use the table.
NEW DELHI: A day after controversy over the alleged removal of the periodic table, sources of energy, and also key chapters on democracy from Class 10 textbooks, NCERT on Friday clarified that these have not been removed from the curriculum rather they are available in Classes 11 and 12.
Commenting on the statement issued by NCERT, Gautam Menon, Professor of Physics and Biology and Dean of Research and Director of the Centre for Climate Change and Sustainability Ashoka University, said, The question is: What parts of science do we expect a 10th standard student - who may not encounter science in later classes - to know?
The NCERT, which is an autonomous body set up in 1961 to assist and advise the central and state governments on policies and programmes for qualitative improvement in school education, also clarified on dropping portions relating to social movements from Class 10, Political Science textbooks, Democratic Politics II and class XII Politics in India Since Independence.
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