Chemistry Diagnostic Quiz

Which of the following statements about subatomic particles is true?

• Protons, electrons and neutrons all have charges.

• The atomic number represents the total number of protons and neutrons in an atom.

• Protons and neutrons are virtually identical except that they have opposite charges.

• Electrons are the smallest and lightest subatomic particle that we have studied.

What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RN

In terms of matter, the atom is almost entirely filled with _____

• orbiting electrons
• charged protons
• heavy neutrons
• empty space

Most of the mass in an atom is made up of _____________________?

• protons and electrons
• protons and neutrons
• neutrons and electrons
• electrons and quarks

The Model of the ATOM has:

• Changed many times

• Never changed

• Changed once

• Changed twice

Consider the following Rutherford-Bohr diagram:

• It represents a neutral atom.

• It represents a positive ion.

• It represents an a negative ion.

• It represents a neutral isotope.

The chemical symbol for this element is:

• Cl

• K

• Ar

• Ca

The atomic number for beryllium is:

• 4

• 5

• 9

• 9.01218

The mass number of argon is probably:

• 18

• 22

• 39.948

• 40

The atomic mass of carbon is:

• 20

• 12

• 12.01

• 40.08