period table Flashcards
What did Newland arrange elements by?
atomic weight
What did Mendeleev do to the period table?
Left gaps for undiscovered element and arranged them in similar properties
How did Moseley arrange elements?
Atomic number
what properties of group 1?
low density, soft, always form H gas
What are nobal gases?
group 0, full outer shell, no reaction
What is the equation for reacting metal with acid?
Acid+metal= soluble salt+ hydrogen
What salts do nitric acid form?
Nitrate salts
What is the equation for insoluble base with acids?
Insoluble base+ acid= soluble salt+ water
What are group 7 known as and what are their properties?
Halogens
1) low meting and boiling point
2) poor conductors
3) toxic
What are halogens joined by?
Covalent bonds
How do halogen molecules differ from other groups?
1) diatonic molecules
2) exits in pairs
What are transition metals and what are their properties?
In the middle of the period table (found between group 2 and 3)
1) good conductors
2) high density
3) hard/ strong
4) hugh melting points
