1. TCAP REVIEW LESSON 13 NOTES Voc. Foldable V
The periodic table
TCAP REVIEW LESSON 13 NOTES
Voc. Foldable V

2. ATOMIC MASS
The number of protons and neutrons in the nucleus of one atom of an element.

3. PERIODIC TABLE
Organizes information about all the known elements according to their properties.

4. ATOMIC NUMBER
The number of protons in its nucleus

5. PERIOD
Horizontal row in the periodic table

6. GROUP
A vertical column in the periodic table. Also known as the Chemical Family.

7. VALENCE ELECTRONS
The electrons in the outermost energy level of an atom.

8. REACTIVITY
How likely an element is to form compounds with other elements.

9. METALLOID
Have some properties of both metals and nonmetals.

10. NOBLE GAS
The elements in Group 18. Also known as the Inert Gases.

11. The Periodic Table Notes p.13
Mendeleev arranged the elements in order of their atomic masses
This arrangement of the elements was the first step in producing a useful scientific tool known as the periodic table
Today, elements are arranged in order of atomic number

12. Periods and Groups Periods numbered from 1 to 7
Elements in each period increase in atomic number moving across the row from left to right
Groups are numbered from 1 to 18.
Elements in the same group have similar chemical properties
The number and arrangement of valence electrons tells how atoms of one element will combine with atoms of other elements to form compounds
Elements in groups 1 and 2 and are the main group elements
Elements in Groups 3-12 are called transition element
With the exception of hydrogen, the elements on the left side of the periodic table are metals
Elements on the right side of the periodic table are nonmetals

13. Chemical Families
The most chemically active metals are in Group 1 (alkali metals)
Group 2 are called alkaline earth metals, highly reactive but are slightly less reactive and harder than Group 1
Group 3 through Group 12 are called Transition elements (hard solids; high melting points)
Metalloids: fall along a jagged line on the periodic table between the metals and nonmetals.
Noble Gasses: these gases are the least reactive elements.

14. The Periodic Table HW p. 11
1. Which of the following is the basis for arranging the elements in the modern periodic table?
alphabetical order c. number of protons
mass of atoms d. date of discovery
2. How many elements are listed in the modern periodic table?
a c. 72
b d. more than 100

15. 3. What do elements in the same column have in common. a
3. What do elements in the same column have in common? a. similar chemical properties b. same number of protons c. same atomic masses d. same size of their atoms