Ch3 Flashcards
(17 cards)
The__ is a tabular arrangement of elements in order of increasing
atomic number.
periodic table
periodic law: “The properties of elements are___ of their atomic numbers. ”
periodic functions
periodic repetition of the elements’
properties is called the
periodic law
periodic table consists of
18 groups and 7 periods: group is vertical , periods are horizontal
Elements in the same group have similar____ because they have the same number of valence electrons.
chemical and physical properties
Elements in the same period possess the same__, and they have properties that change progressively across the table.
energy level
Elements in the periodic table can be classified according to their
natures, electronic configurations, and properties
elements of the periodic table can be divided into three main categories:
Metals Non-Metals Metalloids (Semi-metals)
Largest class of elements
Metals and they are all solids except for mercury is liquid at room temperature
Which metal , which are soft, have a low density, are very reactive chemically
Light metals
Which metal are located at the far left of the table (Groups IA and IIA), e.g., Sodium (Na) and Magnesium (Mg).
Light metal
Which metal, which are hard, have a high density, do not react readily, and are useful structural materials.
Transition metals
Which metal are located in the middle of the table (the B groups), e.g., Iron (Fe) and Titanium (Ti).
Transition metal
___ are gases e.g., Oxygen, Nitrogen, and Chlorine (O, N, Cl); some
are solids e.g., Sulphur and Iodine (S, I); one is a fuming dark red liquid e.g.,
Bromine (Br).
Non metals
are semiconductors of electricity and are widely used in electrical components, e.g., Silicon (Si) and Germanium (Ge).
Metalloids (Semi-metals)
Elements in the periodic table can be sorted into 4 different groups (blocks) based
on their electron configurations.
S p d f
Stopped at p 40
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