Which of these elements has the smallest atomic radius?

An atom contains 70 protons, 70 electrons, and 99 neutrons. What is the mass number?

Which of the following particles has a positive one charge?

According to the periodic table, Na will most likely react with elements in which of these groups?

Which element is a noble gas?

When copper reacts with oxygen in the air, a color change takes place, and the metal changes color from reddish brown to green. What type of change occurs to produce this color change?

Which of the following is true for an earthquake wave, but not for an electromagnetic wave?

Why do atoms of elements have neutral charges?

Which of the following properties of atoms can be used to identify an atom?

The molecules in a sample of matter move independently of one another. The substance takes the shape of its container. When the substance is moved from one container to another, its shape changes, but its volume remains the same. What is it?

Which property of matter is determined by measuring the pull of gravity on a sample of matter?

In which of the following media would you expect sound waves not to travel?

Which of the following subatomic particles contributes significantly to the mass of an atom but does not contribute to its electrical charge?

Which of the following examples is an example of a physical change?

Which of the following is NOT an example of an electromagnetic wave?

Potassium is an element in group 1 and period 4. How many valence electrons does an atom of potassium contain?

What phase change occurs when a solid changes directly into a gas?

What type of arrangement and motion do particles in a liquid have?

Materials that prevent heat flow are

What happens to the number of energy levels as you travel from the top to bottom in a group on the periodic table?

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