the smaller unit of an element that that retains its properties as an element
What is an atom
100
an atomic number?
What is the number of protons in the nucleus of each atom of an element
100
Visible light, X rays, infrared radiation, and radio waves all have the same
What is speed
100
a positive ion
What is cation
100
a double or triple bond
What is multiple bond
200
a periodic group
What is a vertical column in the periodic table.
200
atoms of the same element that have different masses
What is isotopes
200
The statement that an electron occupies the lowest available energy orbital is
What is the Aufbau principle
200
the physical and chemical properties of the elements are periodic functions of their atomic numbers
What is periodic law
200
a covalent bond produced by the sharing of one pair of electrons between two atoms
What is single bond
300
a substance that has a fixed composition and differs from a mixture in that every sample of a given pure substance has exactly the same characteristic properties and composition
What is a pure substance
300
mass is neither created nor destroyed during ordinary chemical or physical reactions
What is law of conservation of mass
300
The Bohr model of the atom was an attempt to explain hydrogen's
What is line-emmison spectrum
300
A chemical bond resulting from the electrostatic attraction between positive and negative ions is called a(n)
What is ionic bond
400
What are the four states of matter
What are solid, liquid, gas, and plasma
400
if two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers
What is law of multiple proportions
400
A quantum of electromagnetic energy is called
What is a photon
400
Mendeleev predicted that the spaces in his periodic table represented
What is undiscovered elements
500
What is a metalloid
What is an element that has some characteristics of metals and some characteristics of nonmetals
500
What is the exact number of Avogadro’s number
What is 6.022 1367 × 1023
500
Evidence gathered since Mendeleev's time indicates that a better arrangement than atomic mass for elements in the periodic table is an arrangement by
What is atomic number
500
That the boiling point of water (H2O) is higher than the boiling point of hydrogen sulfide (H2S) is partially explained by