Periodic Table Flashcards
a chart that organizes information about all the known elements according to their properties
Periodic Table
a code, usually made up of one or two letters, used to represent an element
Chemical Symbol
the number of protons in the nucleus of an atom; used to identify an element
Atomic Number
a measure of an atom’s mass that is equal to the number of protons and neutrons in the atom’s nucleus
Atomic Mass
a horizontal row in the periodic table
Period
a vertical column in the periodic table; also called a chemical family
Group
a group of chemical symbols and numbers that shows the number of atoms of each element in a molecule.
Chemical Formula
An element that conducts heat and electricity well, is shiny, and can be hammered into sheets or drawn into wires
Metal
an element that does not conduct heat or electricity well and is dull and brittle or gaseous
Non Metal
an element that has some properties of both metals and nonmetals
Metalloid
one of six elemental gasses that does not naturally react with other element; Group 18 in the periodic table
Noble Gases
the tendency of a substance to undergo chemical changes
Reactivity
Elements in the same column of the Periodic Table all . . .
A. Have the same number of protons
B. Share the same atomic structure
C. Have similar physical characteristics
D. Share the same number of neutrons
C. Have similar physical characteristics
An unknown element reacts with alkali metals. Which is the BEST conclusion about the unknown element?
A. It is a noble gas
B. It is in group 16
C. It is in group 17
D. It is an earth alkaline metal
C. It is in group 17
Which BEST describes a row of elements in the periodic table?
A. Column
B. Family
C. Group
D. Period
D. Period
Which elements are the least reactive on the periodic table?
A. Halogens
B. Noble gases
C. Alkali metals
D. Transition metals
B. Noble gases
Which groups have the most highly reactive elements?
A. IA and VIIA
B. IA and VIIIA
C. IIA and VIIIA
D. IIA and VIIA
A. IA and VIIA
Which BEST describes Groups 3 through 12 of the periodic table?
A. Alkaline earth metals
B. Transition metals
C. Metalloids
D. nonmetals
B. Transition metals
What is the significance of metalloids?
A. They separate liquids from solids
B. They separate metals from nonmetals
C. They separate elements from compounds
B. They separate metals from nonmetals
Which element in Period 3 is known to be a highly reactive metal?
A. Sulfur (S)
B. Argon (Ar)
C. Sodium (Na)
D. Scandium (Sc)
C. Sodium (Na)
Which element is MORE LIKELY to react with sodium (Na)?
A. Magnesium (Mg)
B. Aluminum (Al)
C. Oxygen (O)
D. Radon (Rn)
C. Oxygen (O)
Sodium reacts with water. Which element is MOST LIKELY to have a similar effect when exposed to water?
A. Carbon
B. Oxygen
C. Lithium
D. Gold
C. Lithium
What do the atomic numbers represent?
Number of Protons
