2. Atomic Structure Post test

The number of electrons in the valence shell of the Nitrogen atom is            .

The number of neutrons in an atom of ⁴⁰₁₈Ar is

The number of electrons in a neutral chlorine (Cl) atom

Match the description with the corresponding subatomic particle.

Which of these best describes the subatomic particles X in the diagram below?

Match the following properties of the element below

The particles located within X have

The number of protons and neutrons combined together in an atom of ⁴⁰₁₈Ar is  (Think!  How do you get the mass number?)

Match the atoms with their correct elements.

All three of the atoms below have the same number of                                              which means they will all have                                                                    .

Match what each part of the following element card represents.

Select all of the following that are NOT characteristics of a neutral atom of Lithium.

Order the parts of an atom from lightest to heaviest in mass.

Which of the following is true of an atom?

The mass number of an atom represents the total number of

The first atomic model was introduced by

Look at the picture below.

Why does the nucleus of an atom have a positive charge?

                  and                    combine together to make the atomic mass of an atom.  (Select the two that apply)

Which particles determine the atomic number of an element?

Match the following properties for the neutral atom of the element below.

An element is said to have the following characteristics:

• Does not conduct heat or electricity well
• Needs to gain two electrons in order to be stable
• Bonds well with carbon
• Needed for us to survive

Which element is being described?  Use your knowledge of the elements to determine which element it is.  Explain your answer in detailed full sentences, making sure to discuss each bullet point listed above.