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Unit 1 - Lesson 3

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by

Ahmed Hussein

on 4 September 2016

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Transcript of Unit 1 - Lesson 3

add logo here
Chemical symbols of elements
Matter
is consisted of molecules. Molecules are consisted of smaller particles called atoms.
أAhmed
ElBasha
Chemists
use symbols which easily express the elements.The following table includes the symbols of some of the most famous used atoms of elements.
Atomic construction:

The scientists operated many experiments to reach the fnal idea about the atomic construction of nucleus and electrons:

Unit 1 - Lesson 3
Atomic Structure of Matter

A. Nucleus
From the table , we fnd:
1. The symbol represents one individual atom.
2. If the element symbol was one letter it is written in capital.
3. Some elements have more than two letters as a symbol, that because
the frst letter was common in these elements such as Calcium and
Carbon. So we have the carbon of symbol C while the calcium of
symbol Ca, the frst letter is written in capital and the second in
small.
4. Some elements are not derived from English names of the elements and so they have symbols taken from Latin language which are of different letters.

To express an atom of any element we use two terms:
Atomic number:
it is the number of the positive charged particles
(protons) and it is written to the left side below the symbol of the
element.
Mass number:
is the sum of protons and neutrons number found inthe nucleus, it is written above the symbol.
The number of protons may equal the number of neutrons, or the
number of neutrons may exceed the protons number and this increases
the mass of the atom. If the protons number changes the positive charge
of the nucleus changes and also both atomic and mass numbers change
and so the atom became of another element.
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