यदि आप यह संदेश देख रहे हैं तो इसका अर्थ है कि हमें अपनी वेबसाइट पर एक्सटर्नल रिसोर्सेज को लोड करने में समस्या हो रही है।

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

मुख्य कॉन्टेंट

यूनिट 5: Periodic classification of elements

इस यूनिट के बारे में

Learn how the periodic table organizes the known elements of our world. In this unit, we will learn about the history of the periodic classification of elements, Mendeleev's periodic law, its merits and demerits. We will also learn about the modern periodic law, groups and periods, periodic trends - valence electrons, valency, atomic size, metallic, nonmetallic, electropositive, and electronegative characters.