Chapter 4 Flashcards
What’s John Dalton’s atomic theory?
- Each element is composed of tiny indestructible particles called atoms.
- All atoms of a given element have the same mass and other properties that distinguishes them from the atoms of other elements
- Atoms combine
What’s amu?
Atomic mass unit
One-twelfth of the mass of a carbon atom containing 6 protons and and 6 neutrons
When charge equalization happens?
When the charged balance of a matter is disturbed
What’s the atomic number?
The number of protons in the nucleus and its symbol is Z
Atomic symbol of lead
Pb
Atomic symbol of mercury
Hg
Iron
Fe
Silver atomic symbol
Ag
Tin atomic silver
Sn
Copper
Cu
Gold
Au
Name of element P
Phosphorus
Mendeleev periodic law
When element are arranged in order of increasing atomic mass certain sets of properties recur periodically
What is this property of metal called: can be drawn into wires?
Ductility
Metals can be pounded into flat sheets. This is called
Malleability
Elements whose properties are predictable
Main group elements
Elements whose properties are less predictable
Transition elements
What the group 1A elements are called?
alkali
What’s the name of group 2A metals?
Alkaline earth metals
Which group is more reactive? alkali or alkaline?
Alkali
What’s the name of group 7A?
Halogen
The sum of the number of neutrons and protons in an atom is called ….
Mass number
Symbol is A
