Fast and Curious: Atom and Periodic Table

Atomic Mass

• The mass of the electron cloud

• The amount of protons + neutrons in an atom.

• The small, dense part of an atom.

• The outermost electrons in the electron shell.

In the modern periodic table elements are arranged by:

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

Using the picture from a periodic table, what is the Atomic Number?

• 26

• Fe

• 55.845

• 56

When two atoms of the same element have different atomic masses, they are called ______, and have a different number of ______.

• Neutrons; Isotopes

• Atoms; Isotopes

• Isotopes; Protons

• Isotopes; Neutrons

If a potassium atom lost one electron, what would be the symbol for that ion?

• 
• 
• 
• 

Elements in the same column of the periodic table always have the same # of _______ as one another.

• Protons
• Neutrons
• Electrons
• Valence Electrons

What scientist proposed this atomic model?

• Dalton

• Thomson

• Rutherford

• Bohr

Which is an electron?

• A
• B
• C

Elements in the same period have the same number of _____.

• Electron Shells

• Valence electrons

• Protons

• Neutrons

What scientist proposed this atomic model?

• Dalton

• Thomson

• Rutherford

• Bohr