atomic structure
DESCRIPTION
Atomic Structure. Atomic Structure. Protons and neutrons are found in the nucleus or centre of an atom and make up most of the weight of an atom they have a similar weight to each other. Electrons Spin. Electrons are found spinning very rapidly around the nucleus and have virtually no weight. - PowerPoint PPT PresentationTRANSCRIPT
Atomic Structure
Protons and neutrons are found in the nucleus or centre of an atom and make up most of the weight of an atom they have a similar weight to each other.
Electrons Spin
Electrons are found spinning very rapidly around the nucleus and have virtually no weight.
Moving electrons
Protons = Electrons
An atom has an overall electrical charge of 0.
Inside an atom there is the same number of protons as electrons.
E.g. sodium – 11 protons (11+), 11 electrons (11-)
E.g. carbon – 6 protons(6+), 6 electrons(6+)
There are approx 100 different types of atoms, each type is known as an element.
Pictures of elements of the periodic table
Each element has it’s own special atomic number
The atomic number is determined by the number of protons in the nucleus.
Eg. Sodium – 11 protons = atomic number 11 Eg. Carbon – 6 protons = atomic number 6
Each element has a different number of protons
Periodic Table
On your provided table write out the atomic numbers, names and symbols of the first 20 elements
The periodic table is on the next slide - The atomic number is in the top left corner of each square, the name is across the bottom of each square and the symbol is in the middle of each square.
Periodic Table
You are expected to learn the first 20 elements by name and symbol.
Periodic Table Song
This is a simplified version of the Periodic Table
Summary so far
Atomic Number = no. of protons
Number of protons = number of electrons
Neutral overall charge
atomic number = number of protons = number of electrons
Eg if the atomic number = 7 then number of protons = 7 and the number of electrons = 7
If the atomic number = 3 then the number of protons = 3 and the number of electrons = 3
Fill out Protons and Electrons in your table
Mass Number
Mass Number = the total weight of the atom
Mass Number = no. of protons + no. of neutrons
To calculate the Mass Number - Make a whole number from the Relative Atomic Mass found on the periodic table.
Eg RAM = 22.9 therefore mass number = 23 Eg RAM = 35.45 therefore mass number = 35
Fill out the Mass Numbers in your table
Neutrons = Mass Number – Atomic Number
To find the number of neutrons subtract the atomic number from the mass number.
Eg Mass no. = 24, Atomic no. = 12 (24 - 12 = 12) therefore number of neutrons = 12
Eg mass no. = 20, Atomic no. = 10(20 – 10 = 10) therefore number of neutrons
= 10
Fill out number of neutrons in your table