Atom and periodic table

Isotopes are atoms of the same element that have different

• masses
• # of protons
• # of electrons
• chemical properties

All atoms of the same element have the same

• atomic mass
• mass number
• number of neutrons
• atomic number

An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is

• 13
• 14
• 27
• 40

Protons are located in the nucleus of the atom.
A proton has _______________.

• No charge
•  A negative charge
• A positive and a negative charge
• A positive charge

Neutrons are in the nucleus of the atom.
A neutron has _____________. 

• A positive charge
• No charge
• A negative charge
• Twice as much positive charge as a proton

The atomic number of an atom is _____________________.

•  The mass of the atom
• The number of protons added to the number of neutrons 
• The number of protons 
• Negatively charged 

The atomic mass of an element is equal to:

• # of protons
• # of neutrons
• # of electrons
• Total # of protons and neutrons.

Electrons are found in the nucleus of an atom.

• True
• False

What is the atomic number of calcium?

• 20
• 40
• 40.078
• 20.078

Elements in the same group have similar chemical properties.

• True
• False