Periodic Table
How are elements sorted?
By chemical and physical properties.
What is the symbol for Hydrogen?
H.
What does a molecular formula show for an element?
It shows how many atoms each element a substance contains.
What is the highest occupied energy level of an element's atom?
Valence electrons.
What is the definition of measurement?
A quantity that has both a number and a unit.
How did Dmitri Mendeleev arrange the elements in the periodic table?
By the increase of atomic mass.
What is the symbol for Chlorine?
Cl.
What is the representative unit of a molecular compound?
A molecule.
An anion is produced when an atom gains what?
One or more valence electrons.
A given number written as the product of two nmbers.
What are the three classes of elements?
Metals, nonmetals, and metalloids.
What is the symbol for Rubidium?
Rb.
What is the definition of Covalent bonds?
Atoms that are held together by sharing electrons.
The ions produced when atoms and other halogens gain electrons are called what?
Halide ions.
The measured value must be compared to the correct value.
Is silicon a metal, nonmetal, or metalloid?
Metalloid.
What is the symbol for Mercury?
Hg.
What compounds are composed of 2 or more nonmetals?
Molecular compounds.
Ionic compounds are electrically what?
Neutral.
How many multiples are metric units based on?
10.
Why is atomic number better than atomic mass for organizing the elements in the periodic table?
The atomic number stays the same for all isotopes for all elements while the atomic mass will always change.
What is the symbol for Mendelevium?
Md.
What is the bond between two atoms held together by sharing one pair of electrons?
A single covalent bond.
What compounds have high melting points?
Ionic compounds.
What is the basic unit of length?
Meter.