CHAPTER 13 AND 14

     …………. are unreactive nonmetals and are Group 18 of the periodic table.

• Noble gases               

• Alkali metal

• Hydrogen  

• a)    Halogen

1)          ____________________________ are elements in Group 1 of the periodic table.

• Alkali earth metal

• noble gases

• alkali metal

• halogen

Each vertical column of elements from top to bottom on the periodic table is called a ....................

• period

• group

• line

• arrow

1)          ________________________is the sum of protons and neutrons in an atom.

• atomic mass

• mass number

• atomic number

• mass

The horizontal row on the periodic table is called a

• group
• family
• period
• atomic number

Most of the elements on the periodic table are classified as _____.

• Metals
• Nonmetals
• Metalloids
• Periods

This class of elements are sometimes called "semiconductors."

• Metals
• Nonmetals
• Metalloids
• Groups

      Isotopes exist because the atoms of the same element may NOT contain the same number of ……..

• neutron

• proton

• electron

• atom

2.      The SI unit of electric current is………

• Amperes (amps

• watt

• Newton  

•  gram

2.      Which of the following particles has NO electric charge?

• proton

• electron

• neutron

• atom