Question

group of elements with the same number of valence electrons. vertical column in the periodic table of elements such as alkali metals or halogens. a horizontal row of elements in the periodic table. this is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table. these are the highly reactive elements located in group 1 of the periodic table. these elements have one electron in their outer energy level which makes them highly reactive with water and halogens. these are the reactive elements located in group 2 of the periodic table. these elements have two electrons in their outer energy level which makes them reactive with water and halogens. these are the group 3 or d - block elements. these dense metals with high boiling points can have different oxidation states and all are solid at room temperature with the exception of mercury. this is the highly reactive family of elements with 7 valence electrons. this is an element with full valence shell, very unreactive. this is a group of elements with few valence electrons that conducts heat and electricity. one of a class of elements having properties intermediate to metals and nonmetals.

Explanation:

1. Elements with the same number of valence - electrons are in the same group.
2. Vertical columns in the periodic table are groups.
3. Horizontal rows are periods.
4. Patterns in the periodic table that increase or decrease across or down are periodic trends.
5. Group 1 elements are alkali metals.
6. Group 2 elements are alkaline - earth metals.
7. Group 3 or d - block elements are transition metals.
8. Elements with 7 valence electrons are halogens.
9. Elements with full valence shells are noble gases.
10. Elements with few valence electrons that conduct heat and electricity are metals.
11. Elements with properties intermediate to metals and nonmetals are metalloids.

Answer:

1. Group
2. Group
3. Period
4. Periodic trend
5. Alkali metals
6. Alkaline - earth metals
7. Transition metals
8. Halogens
9. Noble gas
10. Metal
11. Metalloid