NST2601 Assignment 3 ANSWERS 2025 - DUE 31 July 2025

NST2601
ASSIGNMENT 3 2025
DUE 31 JULY 2025

, NST2601 Assignment 3 2025
DUE: 31 July 2025




QUESTION 1


1.1 Define the following:


a. Particle
A particle is the smallest unit of matter. According to the Particle Model of Matter, all
substances are made up of extremely small particles that are in constant motion
(NST2601, Study Unit 2). These include atoms and molecules.


📘 (NST2601/1, Study Unit 2)


b. Atomic Model
An atomic model is a scientific representation or theory used to describe the
structure and behaviour of atoms. Over time, these models evolved as new
evidence became available. For example, Dalton’s model viewed the atom as
indivisible, while Thomson’s plum pudding model introduced electrons, and Bohr’s
model placed electrons in energy shells (NST2601, Study Unit 2).


📘 (NST2601/1, Study Unit 2)


c. Subatomic
Subatomic refers to the particles that make up an atom, namely protons, neutrons,
and electrons. These are smaller than the atom itself and have unique masses and
charges (NST2601, Study Unit 2).


📘 (NST2601/1, p. 21)


d. Protons
Protons are positively charged subatomic particles found in the nucleus of an atom.
They have a charge of +1.602 × 10⁻¹⁹ C and contribute to the atomic number and
mass of the atom (NST2601, Study Unit 2).