Periodic Classification of Elements

Phosphorus Both are equally electro negative Nitrogen None of these Na Al Si P Oxygen Calcium Cobalt Potassium 7, 3 17, 3 1, 3 16, 3 F, Cl, Br Na, K, Rb P, S, Cl C, Si, Ge Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is true but R is false. A is false but R is true.(e) Both A and R are false. Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not the correct explanation of A. A is true but R is false. A is false but R is true.(e) Both A and R are false. Atomic mass Atomic number Atomic size Metallic and Non-metallic character Be (4) Ne (10) N (7) O (8) F2 Cl2 Br2 I2 The oxides become more acidic The elements become less metallic There is an increase in the number of valence electrons The atoms lose their electrons more easily 7 14 24 16 Na → Na+ + e– Ca+ → Ca++ + e– K+ → K+ ++ e– C2+ → C3+ + e– MgO CaO Al2O3 Na2O Cl > F > O > Br F > O > Cl > Br F > Cl > Br > O O > F > Cl > Br