Units 3 & 4 Review

Atomic Scientists

100

This philosopher first used the word atomos to describe the smallest piece of matter. 

Democritus

200

This scientist discovered the electron.

JJ Thomson

300

This scientist's gold foil experiment helped him discover the nucleus of the atom.

Ernest Rutherford

400

This scientist created the model that we draw. It has the nucleus in the middle and electrons on rings going around it.

Niels Bohr

500

This scientist discovered radioactivity and was the first person to win a Nobel Prize in both Chemistry and Physics.

Marie Curie

Periodic Table

100

This scientist created the first version of the Periodic Table by arranging paper cards into a rectangle.

Dmitri Mendeleev

200

This Group explodes when it touches water.

Alkali Metals 

(Lithium, Sodium, Potassium, etc.)

300

This shortcut on the Periodic Table tells you how many valence electrons the atom has.

(2nd digit) of Group Number

400

This Group is highly reactive, and includes a key ingredient for bleach, and created poison gas in WWI. 

Halogens

(Fluorine, Chlorine, Bromine, etc.)

500

This term tells you about what kind of ion an atom will become. (Hint: the charge it will become.)

Oxidation Number

Radioactivity

100

You have a sample of Carbon that contains some atoms of C-12 and some atoms of C-14. These two versions of carbon are called ______________.

Isotopes

200

Radioactivity is when energy or particles shoot out of an atom's nucleus. This happens because the nucleus is ____________.

Unstable

300

This type of decay shoots out an electron from the atom's nucleus.

Beta decay

400

This type of decay shoots out a particle made of 2 protons and 2 neutrons.

Alpha decay

500

When you are working with this type of decay, you need a thick wall of lead to protect your body.

Gamma decay

Valence Electrons

100

Lithium

1

200

Chlorine

7

300

Oxygen

6

400

Calcium

2

500

Nitrogen

5

Bonding

100

Bonding takes place among these subatomic particles.

(Valence) Electrons

200

In this type of bond, a metal sends one or more electrons to a nonmetal. The two atoms stick together by their charges attracting.

Ionic bonding

300

In this type of bond, the valence electrons create a freely flowing sea of electrons. This makes the material easy to bend and shape without breaking.

Metallic bonding

400

In this type of bond, two or more atoms share their valence electrons so all shells are stable.

Covalent bonding

500

This type of bond is the strongest. It is the hardest to break.

Covalent bonding