Formation of IONS

Formation of IONS

-understand how some atoms complete their shells

-write chemical formula of compounds

Terminology

• Stable - стабильный

• Particle - частица

• Electron shells - электронные оболочки

• to gain electrons - получать электроны

• to lose electrons - терять электроны

Problem

What are the number of neutrons and the charge of bromine ion?

Solution

A = p + n

n = A - p = 80 - 35 = 45

n = 45

q + e = p

q = p - e = 35 - 36 = -1

q = -1

Writing formulas

Example

NaCl

Example

KNO3

Exercises