Name the following elements a. Two shells both of which are completely filled b. Three shells with 2 valence electrons c. Metals with valency 3, group number 13 and period 3.
(a) Two shells → K L. Filled → 2, 8 . Atomic number → 10. ∴ Element — Neon.. (b)Three Shells - K.L.M . Two Valence Eletrons- 2,8,2. Atomic Number -12. Element - Magnesium. (c) Group 13. Valency -3 . Period -3 K,L,M. Electronic Confuguration - 2,8,3. Atomic Number -13. Element - Alminium
