Periodic Table

A substance that has the same type of atoms and can't be broken down is called...

• Mixture

• Compound

• Element

• Composition

The part of the atom that has a positive charge is called a

• Proton

• Neutron

• Electron

Atoms are made up mostly of

• Tightly packed matter

• Empty Space

To find the mass of an atom you will add the protons and

• Neutrons

• Electrons

The atomic number in an atom is represented by the number of

If an atom has 6 protons and 6 neutrons, what is its atomic mass?

The vertical (up and down) columns in the Periodic Table are called...

• Period

• Atomic Number

• Groups

• Atomic Mass

The Modern Periodic Table of Elements is arranged by

• Atomic Mass

• Valence Electrons

• Atomic Number

• Number of Isotopes

The atomic number tells you what? READ THE ANSWERS CAREFULLY

• only the number of electrons

• only the number of protons

• only the number of neutrons

• the number of both electrons and protons in an atom

In an electrically-neutral atom, what two subatomic particles are equal, number of protons and...?

• Protons

• Neutrons

• Electrons