Chapter 2, Problem 21QRT

Interpretation Introduction

Interpretation:

The number of electrons, protons and neutrons present in atom of Technetium $\text{-99}$ has to be found.

Concept Introduction:

Electrons:

Electrons are constituents of an atom and it is the negatively charged subatomic particle.  It is known as the elementary particle because it cannot be broken down into smaller particles.

Charge of the electron $\text{=-1}{\text{.6×10}}^{\text{-19}}\text{ C}$.

Mass of the electron $\text{= 9}{\text{.1×10}}^{\text{-28}}\text{ g}$.

Protons:

Hydrogen atoms had the smallest mass to charge ratios, indicating that they must be the positively charged fundamental particles of atomic structure.  Such a particle is called a proton.

Charge of the proton $\text{=1}{\text{.6×10}}^{\text{-19}}\text{ C}$.

Mass of the proton $\text{= 1}{\text{.67 × 10}}^{\text{-24}}\text{ g}$.

Neutrons:

It is a sub-atomic particle in an atom which having neutral charge.  They are not positive like protons.