02/27/19 Benchmark Review

What are group 1 metals most likely to do when combining with other substances?

• gain one electron

• lose two electrons

• gain two electrons

• lose one electron

Which scientist saw the atom as a positively charged sphere with negative particles (electrons) embedded within?

• Bohr

• Thomson

• Rutherford

• Dalton

Which scientist discovered that most of an atom's mass is contained in its nucleus and the rest is nearly empty space?

• Rutherford

• Bohr

• Dalton

• Thomson

What is an example of a mixture?

• Air

• Table salt

• Oxygen

• Pure water

All elements in the same group have the same number of __.

• neutrons

• protons

• electrons

• valence electrons

Which two elements do all organic compounds contain?

• hydrogen

• carbon

• oxygen

• nitrogen

What is an example of an element?

• Oxygen

• Pure water

• Air

• Table salt

Which families of the periodic table are the most chemically reactive?

• 1 and 18

• 1 and 17

• 2 and 17

• 17 and 18

Which substance contains an ionic bond?

• F₂

• H₂O₂

• MgBr₂

• CO

Where is most of the mass of an atom located?

• in the nucleus

• evenly spread throughout the atom

• electron cloud

• in the electron