The Modern Periodic Table

  the PERIODIC TABLE lable 4.04.22 the modern periodic table : elements are arranged in rows, called period). to increase atomic No - elements with similar properties are placed in verticle columns (groups) 1 2 group numbers the table is called the H 2 Ar 3 penodic table because eleme- s nts with similar properties occur at regular entivals Mc period numbers electrons in S neils shell the electronic Structure O+ an atom can be predicted eneray level from its atomic number for example the atomic number of sodium is 11. Sodium atoms have " protons and so 11 electrons - two electrons occupy first sneu 2,8,1 - elant electrons OCCUPAR the second shell - one electron occupys the third shell. nucleus election SODIUM -protons neutrons metal lose, now many susie-kennedu Donding ion non metal aain, now manu ion. Non metals + Non metals + metals IONIC metals COVELANT non metals METALLIC metals aain + lose snare charges IONS no charae DIAMOND Li oxyaen 0 0=050 O2 & - 4C'S nudrogen methane Giant lose 1 electron now many they high mpt +bpt need=now many theu-share. does not conduct H H-C-H