Atomic Theory

The cloud model is what we use for the atomic theory now. What does the cloud model look like?

• A ring with gold foil in the middle.

• Electrons orbiting the nucleus like the planets around the sun.

• A cloud of electrons floating around the nucleus.

• A scoop of chocolate chip ice cream. It had electrons scattered within a ball of positive charge.

What two particles would you find in the nucleus of an atom?

• Protons and electrons

• Neutrons and electrons

• Protons and neutrons

• Electrons and negatrons

The scientist responsible for "discovering" the nucleus is:

• Bohr
• Rutherford
• Schroedinger
• Einstein

What did Bohr's atomic theory model look like?

• A ring with gold foil in the middle.

• Electrons orbiting the nucleus like the planets around the sun.

• A cloud of electrons floating around the nucleus.

• A scoop of chocolate chip ice cream. It had electrons scattered within a ball of positive charge.

Who first came up with the idea of an atom and called them "atomos"?

• o Democritus

• o Thomson

• o Rutherford

• o Bohr

He developed the planetary model of the atom.

• Rutherford
• Bohr
• Chadwick
• Dalton

Rutherford and his students did experiments that showed

• Atoms contain negative particles, now called electrons.

• Atoms are mostly empty space.

• Neutrons are located in the nucleus.

• Matter cannot be lost or gained.

What did Thomson's atomic theory model look like?

• A ring with gold foil in the middle.

• Electrons orbiting the nucleus like the planets around the sun.

• A cloud of electrons floating around the nucleus.

• A scoop of chocolate chip ice cream. It had electrons scattered within a ball of positive charge.

What is a negatively charged particle?

• neutron

• electron

• proton

• atom

What did Rutherford discover about atoms?

• An atom is always negatively charged.

• An atom is mostly empty space, but has a dense positively charged center(nucleus).

• An atom is always positively charged.

• All particles will pass straight through gold foil with no change in path.