Atomic Structure

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

• number of energy levels

• atomic masses

• number of valence electrons

• atomic numbers

What is an atom’s nucleus made of?

• protons only

• protons and electrons

• protons and neutrons

• neutrons only

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

• 6

• 8

• 12

• 14

An element with 7 protons, 9 neutrons, and 7 electrons has an atomic number of

• 7

• 9

• 16

• 23

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.

• size

• mass

• energy

• charge

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

• protons

• isotopes

• ions

• molecules

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

• 1

• 2

• 3

• 11

Which particles determine the atomic number of an element?   

• Protons only

• Neutrons only

• Neutrons and protons

• Protons and electrons

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

•  mass number of the atom

• mass number minus the atomic number

• atomic number of the atom

• atomic number minus the mass number