1. 1. The smallest part of an element that still has the properties of that element is a(n)?
A. particle
B. atom
C. matter
D. molecule
2. Any sample of matter that is made up of only one type of atom is/are .
A. molecules
B. the nucleus
C. valence electron(s)
D. an element
3. Most atoms have no electrical charge because they .
A. have equal numbers of charged and non-charged particles
B. have neutrons in their nuclei
C. have equal numbers of protons and neutrons
D. have equal numbers of protons and electrons
4. Which statement about the nucleus of an atom is correct?
A. The nucleus is made of protons and neutrons and has a negative charge.
B. The nucleus is made of protons and neutrons and has a positive charge.
C. The nucleus is made of protons and neutrons and has a neutral charge.
D. The nucleus is made of protons and electrons and has a neutral charge

2. ReviewReview
 AtomsAtoms
 ElementsElements

3. Periodic TablePeriodic Table
 Developed in the mid- 1800Developed in the mid- 1800’s’s
 Dmitri MendeleyevDmitri Mendeleyev
 60 known elements at the time60 known elements at the time
 Organized them in a chartOrganized them in a chart

4. PeriodsPeriods
EachEach “row” is called a period“row” is called a period
All elements in the sameAll elements in the same
“row” are in the same period“row” are in the same period
7 periods7 periods

5. GroupsGroups
EachEach “column” is called a“column” is called a
groupgroup
All elements in the sameAll elements in the same
“column” are in the same“column” are in the same
groupgroup
18 groups18 groups

6. GroupsGroups
EachEach “column” is called a“column” is called a
groupgroup
All elements in the sameAll elements in the same
“column” are in the same“column” are in the same
groupgroup
18 groups18 groups