Periodic Table

Who discovered the nucleus and later the protons?

• Rutherford

• Bohr

• Thomson

• Dalton

Who discovered the electrons?

• Rutherford

• Bohr

• Thomson

• Dalton

How many neutrons does this Copper atom have?

• 63

• 29

• 92

• 34

An atom of the element with atomic number 6 always has _____.

• six protons in its nucleus

• an atomic mass of six

• more than six neutrons

• six electron clouds

All matter is made of .....

• energy

• atoms

• protons

• electrons

An element is made up of only one kind of _____.

• isotope

• proton

• atom

• metal

The atomic number tells you what?

• number of electrons
• number of protons
• number of neutrons
• both electrons and protons in an atom.

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Mendeleeve arranged his periodic table based on...

• alphabetically

• atomic mass

• atomic number

• charge of atoms

Each column in the periodic table is called a 

• period
• group
• cluster
• unit