Atomic Theory

Who came up with the first atomic theory?

• Dalton

• Socrates

• Thomas

• Rutherford

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 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.

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 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.

What is the mass of a proton?

• 1840 amus

• 1 amu

• 1/1840 amus

• It has no mass.

What is a particle with no charge?

• neutron

• electron

• proton

• atom

What is a negatively charged particle?

• neutron

• electron

• proton

• atom

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

• Protons and electrons

• Neutrons and electrons

• Protons and neutrons

• Electrons and negatrons

He discovered neutrons.

• Rutherford
• Bohr
• Chadwick
• Dalton
• Thomson