Question

fill - in - the - blank questions

1. a vertical column of elements in the periodic table is called a ________.
2. a horizontal row of elements in the periodic table is called a ________.
3. the highly reactive metals found in group 1 of the periodic table are called ________.
4. the reactive metals in group 2 of the periodic table are called ________.
5. the metals found in groups 3 - 12, often with multiple oxidation states, are the ________.
6. elements that can conduct electricity under some conditions but not others are called ________.
7. elements that have properties of both metals and nonmetals are called ________.
8. the reactive nonmetals in group 17 of the periodic table are called ________.
9. the stable, nonreactive gases in group 18 are called ________.
10. the two rows of elements placed separately at the bottom of the periodic table are the ______ (top row) and the ______ (bottom row).
11. the smallest unit of matter that retains the properties of an element is called an ________.
12. a stream of electrons discovered by j.j. thomson is known as a ________.
13. a negatively charged subatomic particle found outside the nucleus is the ________.
14. a neutral subatomic particle found in the nucleus is the ________.

Explanation:

These are basic concepts in chemistry related to the periodic - table structure and subatomic particles. The periodic table is organized into columns and rows with specific names for different groups of elements. Subatomic particles have distinct characteristics and locations within an atom.

Answer:

1. Group
2. Period
3. Alkali metals
4. Alkaline - earth metals
5. Transition metals
6. Semiconductors
7. Metalloids
8. Halogens
9. Noble gases
10. Lanthanides (top row), Actinides (bottom row)
11. Atom
12. Cathode ray
13. Electron
14. Neutron