Chapter:6 Part:1 Structure Of Atom Class:7 Sindh text board Jamshoroo.

Structure of an atom (Protons, neutrons and electrons) Atomic Number and Mass Number Distribution of Electrons in shells 2 (K,L,M only) using 2n Formula (1-18 Elements) Valency and Ions Isotopes and their uses Chemical Formulae Law of constant composition All the students will be able to: Describe the Structure of an atom. Differentiate between atomic number and mass numbers. Draw diagrams of the atomic structure of the first eighteen elements in the periodic table. Define valency. Explain formation of ions. Differentiate between cations and anions. Describe isotopes and their uses in medicine and agriculture. Identify the types and number of elements present in simple molecules and compounds. Make chemical formulae from list of anions and cations. State the law of constant composition and give examples.