Atomic structure and properties of matrtials.pptx

In Stage 8, you learnt about the first 20 elements and their symbols in the Periodic Table. Now you will learn more about the structure of the atoms of these elements.
The atoms of the elements increase in mass as you progress from
left to right (starting with hydrogen) and downwards in the Periodic Table.
For example, an atom of hydrogen has less mass than
An atom of sodium.

1. Properties of materials > 2.1 Atomic structure and the Periodic Table Key words atomic number electron shells electronic structure electrostatic forces energy levels Mass number Periodic table

2. Look carefully at the diagrams, showing atoms of increasing mass. The arrangement of the electrons in an atom as numbers. For example, the electronic arrangement for a boron atom can be written as 2,3. This means two electrons in the first electronic shell and three in the next electronic shell. The first shell always fills up before electrons go into the second shell.

3. Questions 1 How many electrons are there in an atom of carbon? 2 How many protons are there in an atom of beryllium? You will need to look at the Periodic Table to answer the following questions. 3 How many neutrons are there in an atom of boron? 4 Draw a diagram to show the structure of an atom of magnesium. 5 What is the name of the element that has the electronic structure 2,8,3? 6 Draw a labelled atomic diagram of the element fluorine. 7 How is the model of the atom we use today different from the Rutherford model?