Unit 7 Test Atomic Structure

Atoms of elements in the same group of the periodic table share the same

• number of energy levels
• number of valence electrons
• atomic numbers
• atomic masses

What is an atom’s nucleus made of?

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

How many electrons will a neutral atom of carbon have if its nucleus has 6 protons and 8 neutrons?

• 2
• 6
• 8
• 14

An element with 5 protons, 6 neutrons, and 8 electrons has an atomic number of

• 5
• 6
• 8
• 11

An element with 5 protons, 6 neutrons, and 8 electrons has a mass number of

• 5
• 6
• 8
• 11

The farther an electron is from the nucleus, the more it has.

• charge
• energy
• mass
• size

Atoms of the same element that have different numbers of neutrons are called

• molecules
• ions
• protons
• isotopes

The total number of electrons in the outer shell of a sodium atom is

• 1
• 2
• 8
• 18

Which particles determine the atomic number of an element?

• Protons only
• Neutrons and protons
• Neutrons only
• Protons and electrons

The total number of neutrons in the nucleus of any atom is equal to the

• mass number of the atom
• atomic number of the atom
• atomic number minus the mass number
• mass number minus the atomic number