The Nuclear Atom

A nucleus of sodium, Na, has 11 protons and 12 neutrons. Which symbol represents this nucleus?

• 
• 
• 
• 

How many protons are in the nucleus of an atom of radium

• 88

• 138

• 226

• 314

A nucleus of the element cobalt may be represented by the symbol in the picture. What is the structure of this nucleus?

• 27 protons and 32 neutrons

• 27 protons and 59 neutrons

• 59 protons and 27 neutrons

• 59 protons and 32 neutrons

A nuclide of strontium is represented by the symbol in the picture. What does the nucleus contain?

• 38 electrons and 50 neutrons

• 38 neutrons and 38 protons

• 38 neutrons and 50 protons

•  38 protons and 50 neutrons

How many electrons are there in a neutral atom of

• 7

• 8

• 15

• 22

What are the numbers of neutrons, protons and electrons in a neutral atom of

• 92 neutrons, 143 protons, 143 electrons

• 92 neutrons, 235 protons, 235 electrons

• 143 neutrons, 92 protons, 92 electrons

• 235 neutrons, 92 protons, 92 electrons

Which conclusion can be drawn from the Geiger-Marsden alpha-particle scattering experiment?

• A positive charge is spread throughout the atom

• Electrons are arranged in orbits

• Electrons are negatively charged.

• There is a dense nucleus in the atom.

A narrow beam of alpha-particles is fired at a thin piece of gold foil. Which is the final direction of the largest number of alpha-particles?

• A

• B

• C

• D

In the Geiger-Marsden experiment, a beam of alpha-particles is fired at a thin sheet of gold in a vacuum. The majority of the alpha-particles pass straight through the sheet without being deflected. What does this show?

• The alpha-particle is uncharged.

• The alpha-particle is very large.

• The nucleus is positively charged.

• The nucleus is very small.