the smallest unit of an element that maintains properties of that element
100
The Bohr model of the atom was an attempt to explain hydrogen's...?
line-emission spectrum
100
What is anion?
a negative ion
100
In metals, the valence electrons are...?
shared by all of the atoms
100
What is bond energy?
the energy required to break a chemical bond and form neutral isolated atoms
200
What are isotopes?
atoms of the same element that have different masses
200
Visible light, X rays, infrared radiation, and radio waves all have the same...?
speed
200
What is cation?
a positive ion
200
The ions in an ionic compound are organized into a(n) ...?
crystal
200
What is a double bond?
a covalent bond produced by the sharing of two pairs of electrons between two atoms
300
What is molar mass?
the mass of one mole of a pure substance
300
A line spectrum is produced when an electron moves from one energy level to a....?
higher energy level
300
What is ground state?
the lowest energy state of an atom
300
The greater the electronegativity difference between two bonded atoms, the greater the per-centage of...?
ionic character
300
What is polar?
having an uneven distribution of charge
400
What is nuclide?
the general term for any isotope of any element
400
Mendeleev is credited with developing the first successful...?
periodic table
400
What is electromagnetic spectrum?
all the forms of electromagnetic radiation
400
As atoms bond with each other, they...?
decrease their potential energy, thus creating more-stable arrangements of matter
400
What is octet rule?
chemical compounds tend to form do that each atom, by gaining, losing, or sharing electrons, has an octet of electrons in its highest occupied energy level
500
What is nuclear force?
a short-range proton-neutron, proton-proton, or neutron-neutron force that holds the nuclear particles together
500
Mendeleev predicted that the spaces in his periodic table represented...?
undiscovered elements
500
What is Heisenberg uncertainty principle?
it is impossible to determine simultaneously both the position and velocity of an electron or any other particle
500
A chemical bond results from the mutual attraction of the nuclei of atoms and...?
electrons
500
What is ductility?
the ability of a substance to be drawn, pulled, or extruded through a small opening to produce a wire