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Chemistry Notes Form 2

Institution: Secondary

Course: Chemistry

Content Category: Form 2 Notes

Posted By: psych2

Document Type: PDF

Number of Pages: 137

Price: KES 300
 
    

Views: 1062     Downloads: 4

Summary

ATOMIC STRUCTURE AND THE
PERIODIC TABLE
Preface
The structure of the atom is extensively covered here. The periodic table is the arrangement of atoms of elements based on their atomic structure. Emphasis on the trends across and down the periodic table of atoms is important for the teacher facilitator. This work should be covered before “Chemical bonding and structure”. The two complements each other in understanding periodicity.
Candidate-user preparing for any secondary level chemistry from members of

A.ATOMIC STRUCTURE
The atom is the smallest particle of an element that take part in a chemical reaction. The atom is made up of three subatomic particle:
(i)Protons
(ii)Electrons
(iii)Neutrons

(i)Protons
1.The proton is positively charged
2.Is found in the centre of an atom called nucleus
3.It has a relative mass 1
4.The number of protons in a atom of an element is its Atomic number

(ii)Electrons
1.The Electrons is negatively charged
2.Is found in fixed regions surrounding the centre of an atom called energy levels/orbitals.
3.It has a relative mass 1 /1840
4.The number of protons and electrons in a atom of an element is always equal

(iii)Neutrons
1.The Neutron is neither positively or negatively charged thus neutral.
2.Like protons it is found in the centre of an atom called nucleus
3.It has a relative mass 1
4.The number of protons and neutrons in a atom of an element is its Mass number
......................


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