Chemistry I Chapter 4 Review

The smallest particle of an element that retains the properties of that element is a(n)

• atom
• electron
• proton
• neutron

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on Earth is made to illustrate which?

• atoms are indivisible
• atoms are very small
• atoms are very large
• there is one penny for every person on Earth

Why did JJ Thomson reason that electrons must be a part of the atoms of all elements?

• Cathode rays are negatively-charged particles
• Cathode rays can be deflected by magents
• an electron is 2000 times lighter than the hydrogen atom
• Charge to mass ratio was the same, regardless of gas

Which of the following is true about subatomic particles?

• Electrons are negatively charged and the heaviest
• Protons are positively charged and the lightest
• Neutrons have no charge and the lightest
• Mass of the neutron nearly equals the mass of the proton

The particles that are found in the nucleus of an atom are

• neutrons and electrons
• electrons only
• protons and neutrons
• protons and electrons

The atomic number of an elements is the total number of which particles in the nucleus?

• neutrons
• protons
• electrons
• protons and electrons

An element has an atomic number of 76.  The number of protons and electrons in a neutral atom of the element are

• 152 p+, 76 e-
• 76 p+, 0 e-
• 38 p+, 38 e-
• 76 p+, 76 e-

The sum of the protons and neutrons in an atom equals the

• atomic number
• nuclear number
• atomic mass
• mass number

What does the number 84 in the name Krypton-84 represent?

• atomic number
• mass number
• sum of p+ and e-
• twice the number of p+

All atoms of the same element have the same

• number of neutrons 
• number of protons
• mass number
• mass