STAAR Vocabulary 5 Flashcards
0
Q
Vertical columns in the periodic table with similar properties; also called families.
A
Groups
1
Q
An arrangement of the elements according to their atomic number.
A
Periodic Table
2
Q
Each horizontal row of elements from left to right on the periodic table.
A
Periods
3
Q
A substance that cannot be broken down chemically into simpler substances.
A
Elements
4
Q
Electrons in the last shell or energy level of an atom.
A
Valence Electrons
