Atomic Structure & Periodic Table

Which of these things did Mendeleev do?

• Left gaps for undiscovered elements

• Discovered electrons

• Switched elements around so their properties fitted better

• Ordered elements by colour

When Mendeleev organised the elements he started by ordering the elements by their atomic . . . .

(a)  

Which of these atomic discoveries was the first:

• Energy levels discovered

• Electrons discovered

• Nucleus discovered

• Neutrons discovered

James Chadwick discovered . . . .

(a)  

Explain how Rutherford's backscattering experiment led to a change in the accepted model of the atom

Starting with the earliest, which is the correct order of contributors to the atomic model?

• Chadwick,

  Bohr,

  Rutherford,

  JJ Thompson,

  Dalton

• JJ Thompson,

  Rutherford,

  Dalton,

  Bohr,

  Chadwick

• Dalton,

  JJ Thompson,

  Rutherford,

  Bohr,

  Chadwick

• Dalton,

  Bohr,

  JJ Thompson,

  Rutherford,

  Chadwick

What is the charge on a proton ?

• 0

• -1

• Negligible

• +1

What is the mass of an electron?

• -1

• Negligible

• 1

What is an isotope?

Wjat is formed when an atom loses or gains electrons?

• An ion

• An element

• A compound

• An isotope