CHEMICAL FAMILIES Alkali metals Position in the periodic
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CHEMICAL FAMILIES Alkali metals Position in the periodic table Physical properties • OER SOURCES • • • . https: //www. khanacademy. org/science/chemistry/periodic-table/copy-of-periodic-table-ofelements/v/periodic-table-introduction https: //www. youtube. com/watch? v=QJe. Tia. Nu. V 78 https: //www. youtube. com/watch? v=ANH-v-jd 9 PQ
Names of elements in group (I) of the periodic table and their electronic arrangement ELEMENT Li Na K ATOMIC NO. ELECTRONIC ARRANGEMENT GROUP PERIOD
GROUP TASK putting Li , Na , K metals in their respective position in the periodic table
Groups report on their group tasks using a skeck of periodic table projected on the • To groups to report on their work ; • Teacher and students can ask questions
correct answers H Li Na K
Video clip
GRADATION IN SIZE AS WE MOVE DOWN THE GROUP EFFECT OF SIZE OF ATOM ON ITS PHYSICAL PROPERTIES i) melting point i)boiling point element Atomic numbe r NO. OF ENERGY LEVELS Li Na K 3 11 19 2 3 4 ATOMIC MELTING RADIUS (nm) POINT(0 C) BOILING POINT ( 0 C)
discussion • Melting point and boiling point decrease down the group due to -Increase in the size of atom as we move down the group • This results in decrease in forces holding the atoms together • These forces are known as METALLIC BONDS
conclusion • Alkali metals are placed in group I of the periodic table because they have 1 electron in the outermost energy level • Atomic radius of the elements increase down the group due to increase in no. of energy levels and electron repulsion • M. p and B. p decrease down the group due to decrease in the strength of metallic bonds
Extended learning assignment What makes alkali metals conductors of electricity? What is ionisation energy • Assignment. ; • Observe the surface of freshly cut sodium and potassium metal and write the observation. • https: //www. youtube. com/watch? v=QJe. Tia. Nu. V 78 • https: //www. youtube. com/watch? v=ANH-v-jd 9 PQ • To be submitted through the class prefect before the next lesson
- Melting point trend
- Periodic table color coded
- Alkali metals periodic table
- Alkali metals periodic table
- Alkali metals periodic table
- Metals metalloids and nonmetals periodic table
- Blank periodic table
- Chemical families in the periodic table
- Big families vs small families
- Ballet terms and positions
- Periodic table of elements families