Review - Atoms and the Periodic Table

What can never change in an element and have that element remain the same?

• the number of protons
• the number of electrons
• the number of neutrons
• the atomic mass

What is the overall charge of an atom is ______ and the overall charge of the NUCLEUS of an atom is _____.

• neutral (0), negative (-)
• neutral (0), neutral (0)
• neutral (0), positive (+)
• positive (+), negative (-)

The mass of an atom may be determined by adding the masses of the protons and neutrons in the nucleus. Why is it unnecessary to include the electrons when determining the mass of an atom?

• because electrons come to and go away from the atom all the time
• because electrons are on the outside of the atom
• because electrons are essentially massless

The one- or two-letter abbreviation of an element on the Periodic Table is called its...

• short form
• contraction
• symbol
• nickname

The vertical (up and down) columns of the Periodic Table are called…

• periods
• rows
• groups

What is the atomic number of germanium?

• 4
• 32
• 40.6
• 72.6

What is the mass number of chlorine?

• 3
• 17
• 35

What is the identity of the element that has 19 protons and 22 neutrons?

• Titanium
• Niobium
• Potassium
• Krypton

Silicon is in what group and period?

• Group 4, Period 2
• Group 4, Period 3
• Group 14, Period 2
• Group 14, Period 3

If the atom to the right does not have an overall charge, which sub-atomic particle is colored in gray in the diagram?

• protons
• neutrons
• electrons