The periodic table
- Created by: Epic Al
- Created on: 23-06-22 17:05
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- The Periodic Table
- Development
- Chemists tried to classify elements
- elements with similar properties are in groups together
- Named because of the regularly repeating patterns in the properties of elements
- Mendeleevs table left gaps for other elements
- when the elements were discovered his version was accepted by scientists
- Electronic structures and the periodic table
- atomic number determines placement
- number of electrons in outer shell defines properties
- group number tells us electrons in outer shell
- atoms of metals generally lose electrons and non metals gain electrons
- noble gases are unreactive as the have a full outer shell
- Group 1
- alkali metals
- MPs and BPs decrease down the group
- produce hydrogen and metal oxide
- react with water
- form positive ions in with a charge of +1 in ionic bonds
- reactivity increases down the table
- Group 7
- Halogens
- form ions with a single negative charge
- can form covalent compounds
- more reactive halogen can displace a less reactive halogen
- reactivity decreases down the group
- transition elements
- higher melting points and densities than alkali metals
- less reactive than alkali metals
- do not react vigorously with water
- metals
- important industrial catalysts
- can form ions with different charges
- Trends
- electrostatic attraction depends on:
- the distance between the nucleus and outer electrons
- number of occupied inner shells
- provide a shielding effect
- nuclear charge
- trends in reactivity is described by going down the groups
- deciding how easy it is for atoms to lose or gain electrons:
- Increased nuclear charge
- extra protons in the nucleus
- going down a group is outweighed by the other 2
- Untitled
- electrostatic attraction depends on:
- Development
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