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Atomic Structure

This was designed for a Masters of Education course assignment - a brief concept overview for non chemistry teachers for a Reciprocal Learning demonstration.
by

Debbie Titmus

on 8 October 2013

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Transcript of Atomic Structure

Subatomic Particles:
Atoms contain a central nucleus that contains the heavier NEUTRONS and PROTONS.
Circling the nucleus are almost weightless particles called ELECTRONS.
ELECTRONS:
Electrons have a negative charge (-)
Oxygen has EIGHT electrons - Eight negative electrons combined with the eight positive protons gives the oxygen atom no charge - neutral.
PROTONS:
Have a positive charge (+).
Found in the nucleus of an atom.
Oxygen has EIGHT protons - this is why it's ATOMIC NUMBER is EIGHT.
NEUTRONS:
Also found in the nucleus.
They have no charge - are neutral.
The number can vary by atom.
ATOMIC NUMBER
The ATOMIC NUMBER:

The number of PROTONS
And in a neutral atom,
the number of ELECTRONS.

So - one atom of Titanium,
element number 22 has:

22 PROTONS & 22 ELECTRONS
ATOMIC WEIGHT
ATOMIC WEIGHT

Titanium has an atomic weight of 47.867.
For this lesson we will round this up to 48.

This is the weight of the nucleus:
The NEUTRONS + PROTONS.

ATOMIC WEIGHT - what it can tell us.

Since the
ATOMIC WEIGHT = PROTONS + NEUTRONS

We can rearrange this equation to calculate the number of NEUTRONS in an atom of Titanium.
(Titanium-48: Atomic weight of 48 and 22 protons)

NEUTRONS = ATOMIC WEIGHT - PROTONS, or
Neutrons = 48 - 22
= 26.

Titanium-48 has 26 NEUTRONS.
Atomic
Number
Full transcript