,chemsitry ,igcse ,0620 ,lesson ,atoms ,subatomic particles ,protons ,neutrons ,electrons ,atomic mass ,atomic number ,neutral ,charge ,postitive ,negatie

1. Protons, Neutrons and Electrons
1- State the relative charges and approximate relative masses of protons, neutrons and electrons
If you tried to cut anything , what do you think the smallest part that you will get if you just keep cutting.
The Atom. The name comes from (a – tom_ meaning can not be divided.
All of the substances around us or even us goes back to the same building units, (The atoms).
Please meet your first atom
Chemists usually draw atoms as circles and write its name inside or a symbol abbreviating its name

2. Let’s concentrate now on the atoms and their structure.
Atoms are very very tiny, they cannot be seen by the naked eye.
A lot of theories were done about the structure of the atom and how the particles inside it are arranged until we reached to the well-known struc
The Atom is electrically neutral, as a whole it has no charge.

3. At the centre it contains a nucleus which is very very very tiny when compared to the whole size of the atom.

4. Unlike the atom the nucleus is not electrically neutral, but due to the its content the nucleus is positively charged.
The space between the atom borders (if it has borders) and its nucleus is filled with electrons which are moving around the nucleus.

5. f we go to check the nucleus and its content and why it is positively charged we will find it contains two types of particles
which we can call Subatomic particles
The Protons which are positively charged
and The neutral Neutrons
so the sum of the two particles Positive + Neutral = Positive
This gives us a positive charge and that is why the total charge of the nucleus is positive
If we sum the positively charged nucleus with the negatively charged electrons
around the nucleus, we will have an explanation of why the whole atom is neutral

6. or in another imaginary diagram

7. Remember