Question

period, group, valence electrons, energy levels, metals, noble gases
1. A vertical column on the Periodic Table is called a _.
2. Elements in the same horizontal row, or _
_, have the same number of electron shells.
3. Elements in the same group have similar chemical properties because they have the same number of
4. The number of
-____ an atom has is determined by the period it belongs to.
5. Most of the elements on the Periodic Table are classified as -________.
6. The _ are found in Group 18 and 1% 3ry stable because their outer shell is full.

Answer 1

1. A vertical column on the Periodic Table is called a group.
2. Elements in the same horizontal row, or period, have the same number of electron shells (energy levels).
3. Elements in the same group have similar chemical properties because they have the same number of valence electrons.
4. The number of energy levels an atom has is determined by the period it belongs to.
5. Most of the elements on the Periodic Table are classified as metals.
6. The noble gases are found in Group 18 and are very stable because their outer shell is full.