Chapter 4.4, Problem 2QQ

Interpretation Introduction

Interpretation:

The correct symbol for an atom of X that has gained three electrons has to be identified among the given options.

Concept Introduction:

Atoms are composed of three types of particles called subatomic particles.  They are as follows:

• Protons: Positively charged particles in an atom.
• Neutrons: Neutral charged particles in an atom.
• Electrons: Negatively charged particles in an atom.

The neutral atom has equal number of protons and electrons.  Gaining or loosing of electrons of an atom form ions.  Negative charged ions are formed by the gaining of one or more electrons and it has more electrons than protons.  Positive charged ions are formed by loss of one or more electrons and it has more protons than electrons.