Chemistry 1st 9wks Part 2

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.

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 a positively charged particle?

• neutron

• electron

• proton

• atom

What is a negatively charged particle?

• neutron

• electron

• proton

• atom

What is a particle with no charge?

• neutron

• electron

• proton

• atom

If oxygen-16 has 8 protons, then how many neutrons does it have?

• 9

• 16

• 8

• 7

How do you know how many electrons an atom has if you know how many protons it has?

• You add them together to equal the atomic number.

• There is no way of knowing

• You add as many electrons as you need to get to the mass number.

• There must be an equal amount of protons and electrons.

How many electrons are in a neutral Sulfur atom?

• 32

• 16

• 48

• 8

How many neutrons would Iron-55 have?

• 56
• 26
• 30
• 33

Cations are...

• Positive

• Negative

• Neutral