Atomic Structure Part 1

Atomic Structure Part 1

by Andrew Baldwin

Multiple Choice

This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. It shows electrons floating freely in a positive region.

• The "Plum Pudding Model" of the atom

• The "Rutherford Model" of the atom

• Democritus's model of the atom

• The "Quantum Mechanical Model" of the atom

Multiple Choice

In the gold foil experiment, most of the positively charged alpha particles passed through the gold foil, but some were deflected or bounced back.  What did we conclude because of this?  

• Atoms are small indivisible spheres

• Atoms are mostly empty space with a small, dense, positive center

• Atoms have negatively charged particles which orbit the nucleus

• Light is a wave, not a particle

Multiple Choice

Which scientist is responsible for first stating that all the atoms of a particular element are identical but are different from the atoms of all other elements?

• Dalton

• Thomson

• Aristotle

• Democritus

• Proust

Poll

Confidence with the last lesson.

• I can teach anyone about the atomic models

• I know them in order but I can't explain fully why.

• I can put some of them in order but I am not very sure.

• I am not sure that I can put any of them in order.

Multiple Choice

An atom is electrically neutral because

• the numbers of protons and neutrons are equal.

• the numbers of protons and electrons are equal.

• neutrons balance the protons and electrons.

Multiple Choice

What is atomic number?

• Number of protons in an atoms 

• Number of neutrons in an atom

• Mass of an atom

• Charge on an atom

Multiple Choice

What electrical charge does a proton have?

• +1

• 0

• -1

• +2

Multiple Choice

What mass does a neutron have?

• 1 amu

• 0 amu

• -1 amu

• +2 amu

Multiple Choice

How many electrons does a sodium atom have?

• 23

• 11

• 12

• 34

Multiple Choice

The __________ of an atom is the sum of the protons and neutrons in the nucleus of that atom.

• mass number

• atomic number 

• atomic weuight

• isotope weight

Multiple Choice

The mass number of an element that has 18 protons, 18 electrons, and 19 neutrons is _____.

• 12.5

• 13

• 25

• 37

Poll

Rate your confidence.

• I got this and can teach it better than you.

• I got it but explaining isn't there yet.

• I think I get but I am not confident.

• I don't think I get it yet.