STAAR Vocab #5 Flashcards
0
Q
vertical columns on 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 in the periodic table.
A
periods.
3
Q
a substance that cannot be broken down chemically into simpler substances.
A
element.
4
Q
electrons in the last shell or energy level of an atom.
A
valence electron.
