Page 26 - E-Science Prep1 2024-2025 t2 Unit1_Neat - Copy

Unit 1 Lesson (2): Acids and Alkalis

P.O.C Positive ion (+ve) Negative ion (-ve)
Cations Anions
1- Its element during
chemical reaction Atom of metallic element Atom of non-metallic element
2- Charges loses an electron or more. gains an electron or more.

3- Electrons and + ve charges = lost - ve charges = gained
protons
4- Number of electrons electrons
energy levels
5- Examples Electrons < Protons Electrons > Protons

Its energy levels < that of Its energy levels = that of its

its atom atom

No. of lost No. of gained

electrons. electrons.

Li+ N-3
Na+ F- Fluoride
K+ Cl- Chloride
Ag+ Br- Bromide
Mg+2 I- Iodide
Ca+2 O-2 Oxide
Zn+2 S-2 Sulphide
Ba+2
Al+3

H+ The only cation

that is derived from a

nonmetal

15

Second Term