Periodic Law and the Periodic Table of Elements Flashcards
1
Q
These two independently developed the precursor to our modern Periodic Table
A
- Dmitri Mendeleev
- Julius Lothar Meyer
2
Q
What law states that “The physical and chemical properties of the elements are periodic functions of their atomic numbers”
A
Periodic Law
3
Q
_____ are arranged vertically down the periodic table (18 columns or group, 1-8A and 3-12B)
A
Family/Groups
4
Q
These elements have the same number of electrons in the outer most shells, the valence shell.
A
Families/Groups
5
Q
3 notable families?
A
- Group 1A - 8A = Representative elements
- Group 3B - 12B = Transition elements/metals
- Lanthanides and Actinides = Transuranium elements
6
Q
_____ are arranged horizontally across the periodic table (rows 1-7)
A
Periods
7
Q
These elements have the same number of valence shells (energy levels).
A
Periods
8
Q
- A substance whose atoms tend to lose electrons during chemical
change - Elements found primarily in the left 2/3 of the periodic table (left)
A
Metals
9
Q
- Properties:
✓High thermal and electrical conductivities
✓High malleability and ductility
✓Metallic luster
✓Solid at room temperature
A
Metals
10
Q
- A substance whose atoms may gain electrons, forming negative ions
- Elements found in the right 1/3 of the periodic table (right)
A
Nonmetals
11
Q
- Properties:
✓Brittle
✓Powdery solids or gases
✓Opposite of metal properties
A
Nonmetals
12
Q
- A substance whose atoms may either lose or share electrons
- Elements found in the staggered stair step line of the periodic table (right)
A
Metalloids
13
Q
- Properties:
✓Brittle
✓Lustrous
✓have properties of both metals and nonmetals
A
Metalloids
14
Q
4 blocks in the periodic table?
A
S, P, D, F blocks
15
Q
Components of major biological molecules
A
H, C, O, N, P, S
