Periodic Table and Classes of Elements
malleable
Elements that are __ can be hammered into thin sheets
groups 3A through 8A
Elements that are characterized by the filling of "p" orbitals are classified as ____.
metals
class of element that is a good conductor of heat and electric current
J.J. Thomson
discovered the electron using a cathode ray tube
alkali metals
group 1A elements
electrons
subatomic particles that are transferred to form positive and negative ions
inner transition metals
the highest orccupied s sublevel and a nearby f sublevel contain electrons
conducts heat
Copper is sometimes coated on the bottom of cookware. What property of copper makes it desirable for this use?
atoms
Democritus first suggested the idea of _ in 4th Century B.C.
principal energy level
Each period in the periodic table corresponds to ____.
solids
Most metals are _____ at room temperature.
gases
Most nonmetals are ___ at room temperature
neon
Of the elements Pt, V, Li, and Ne, which is a nonmetal?
Bohr
Rutherford's nuclear model is modified by ___ to reflect electrons in fixed circular paths around the nucleus
Schrodinger
The mathematical foundation for today's model was the work of____
number
The modern periodic table is arranged in order of increasing atomic ____.
nonmetals
What class of elements are brittle and poor conductors of heat?
Group A
What is another name for the representative elements?
conducts electricity, ductile
What two properties of copper make it desirable for use in wiring?
malleable, lustrous
What two properties of silver and gold are desirable for use in making jewelry?
8A
Which group in the periodic table is known as the noble gases?
nickel
Which of the following elements is a transition metal? (cesium, nickel, tellurium, tin)
magnesium
Which of the following elements is in the same period as phosphorus? (Carbon, Magnesium, Nitrogen, Oxygen)
The highest occupied s and p sublevels are completely filled.
Which of the following is true about the electron configurations of the noble gases?
Group 2A
metals having only 2 electrons in the highest occupied energy level
Quantum mechanical
model is bases on probability of finding the electron in 3-D space
Plum pudding
model was poisitive sphere with negative particles embedded inside
halogens
nonmetals of 7A
Rutherford
performs the gold foil experiment and concludes the atom is mainly empty space with a small positive nucleus
transition metals
type of element characterized by the presence of electrons in the d orbital
group
vertical column in the periodic table
periodic law
A repetition of properties occurs when elements are arranged in order of increasing atomic number is ________.
ductile
An element is ___ if it can be drawn into a wire.
valence electrons
____ are important in predicting the behavior of elements.
Goldstein
discovers a positive particle about 1840 times the mass of the electron
period
horizontal row in the periodic table