https://www.khanacademy.org/science/odia-class-10-physical-sciences/x28e877d8a7566183:periodic-classification-of-elements/x28e877d8a7566183:modern-periodic-table/v/the-modern-periodic-table-chemistry-khan-academy 2020-09-04T10:56:27Z The modern periodic table The modern periodic table is based on the periodic law: "The chemical properties of elements are a periodic function of their atomic number." Let's see how is this different from Mendeleev's periodic table and how this solves for its predecessor's limitations. More free lessons & practice https://www.khanacademy.org/science/in-in-class-10-chemistry-india Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Created by Ram Prakash Ram Prakash video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw The modern periodic table The modern periodic table is based on the periodic law: "The chemical properties of elements are a periodic function of their atomic number." Let's see how is this different from Mendeleev's periodic table and how this solves for its predecessor's limitations. More free lessons & practice https://www.khanacademy.org/science/in-in-class-10-chemistry-india Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Created by Ram Prakash https://cdn.kastatic.org/ka-youtube-converted/QjRN0rkt-gg.mp4/QjRN0rkt-gg.mp4 506 Classification of elements - The Periodic Table https://www.khanacademy.org/science/odia-class-10-physical-sciences/x28e877d8a7566183:periodic-classification-of-elements/x28e877d8a7566183:groups-periods/v/given-atomic-number-find-position-and-vice-versa-solved-example-chemistry-khan-academy 2020-09-04T10:56:23Z Given atomic number find position and vice-versa (Solved example) If you are given with the atomic number of an element you can find it's period number and group number. The period number is related to the number of electron occupied shells in the element and the period number is linked to its valence electrons. Let's see how. More free lessons & practice "https://www.khanacademy.org/science/in-in-class-10-chemistry-india" Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Created by Ram Prakash Ram Prakash video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Given atomic number find position and vice-versa (Solved example) If you are given with the atomic number of an element you can find it's period number and group number. The period number is related to the number of electron occupied shells in the element and the period number is linked to its valence electrons. Let's see how. More free lessons & practice "https://www.khanacademy.org/science/in-in-class-10-chemistry-india" Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Created by Ram Prakash https://cdn.kastatic.org/ka-youtube-converted/Sy_rpHWhVZA.mp4/Sy_rpHWhVZA.mp4 668 Classification of elements - The Periodic Table https://www.khanacademy.org/science/odia-class-10-physical-sciences/x28e877d8a7566183:periodic-classification-of-elements/x28e877d8a7566183:periodic-trends-in-valency-atomic-size/v/periodic-trend-of-valency 2020-09-04T10:56:22Z Periodic trend of valency Valency first increases and then decreases as we go from left to right in a period but remains the same in a group. Let's see why. More free lessons & practice https://www.khanacademy.org/science/in-in-class-10-chemistry-india Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Created by Ram Prakash Ram Prakash video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Periodic trend of valency Valency first increases and then decreases as we go from left to right in a period but remains the same in a group. Let's see why. More free lessons & practice https://www.khanacademy.org/science/in-in-class-10-chemistry-india Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Created by Ram Prakash https://cdn.kastatic.org/ka-youtube-converted/ge1lyL8UVaI.mp4/ge1lyL8UVaI.mp4 667 Classification of elements - The Periodic Table https://www.khanacademy.org/science/odia-class-10-physical-sciences/x28e877d8a7566183:periodic-classification-of-elements/x28e877d8a7566183:periodic-trends-in-valency-atomic-size/v/atomic-radius-trends-in-periodic-table 2025-11-19T10:30:49.845793668Z Atomic radius trends in periodic table The atomic radius tends to decrease across the period and increase down the group. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/fdb8fac1-41dc-483f-aa79-df45c2c6e057_1280_720_base.png Atomic radius trends in periodic table The atomic radius tends to decrease across the period and increase down the group. https://cdn.kastatic.org/ka-youtube-converted/plAcz18P9NQ.mp4/plAcz18P9NQ.mp4 560 Classification of elements - The Periodic Table https://www.khanacademy.org/science/odia-class-10-physical-sciences/x28e877d8a7566183:periodic-classification-of-elements/x28e877d8a7566183:periodic-trends-in-metallic-and-non-metta/v/periodic-trend-of-metallic-character 2020-09-04T10:56:26Z Periodic trend of Metallic character Metallic character can be measured by the ease of an element to give away its valence electrons. It depends on the valence electron’s i) effective nuclear charge (ENC) and ii) distance from the nucleus. Let's see what's the periodic trend of Metallic character. Created by Ram Prakash Ram Prakash video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Periodic trend of Metallic character Metallic character can be measured by the ease of an element to give away its valence electrons. It depends on the valence electron’s i) effective nuclear charge (ENC) and ii) distance from the nucleus. Let's see what's the periodic trend of Metallic character. Created by Ram Prakash https://cdn.kastatic.org/ka-youtube-converted/q892VdYpsUA.mp4/q892VdYpsUA.mp4 882 Classification of elements - The Periodic Table https://www.khanacademy.org/science/odia-class-10-physical-sciences/x28e877d8a7566183:periodic-classification-of-elements/x28e877d8a7566183:periodic-trends-in-metallic-and-non-metta/v/ionization-energy-trends-in-periodic-table 2025-11-19T10:30:49.845793668Z Ionization energy trends in periodic table Ionization energy increases across the period and decreases down the group. Let's learn why. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/6f9de8c9-0d4f-4e56-8c84-ad04cd44f528_1280_720_base.png Ionization energy trends in periodic table Ionization energy increases across the period and decreases down the group. Let's learn why. https://cdn.kastatic.org/ka-youtube-converted/JaIskXCyzQ4.mp4/JaIskXCyzQ4.mp4 444 Classification of elements - The Periodic Table https://www.khanacademy.org/science/tg-board-preparation-class-10/xa97495786f3cc874:week-1/xa97495786f3cc874:periodic-classification-of-elements/e/periodic-classification-of-elements 2026-01-19T12:10:35.018251267Z Classification of elements - The Periodic Table Let's solve a mix of questions khan academy exercise