in a video store, the latest movies are usually placed on the shelves in alphabetical order. older...

26
In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or Comedy. The manager has to choose a set of categories and then place each movie in the most appropriate location.

Upload: brianna-mclaughlin

Post on 19-Jan-2016

214 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

In a video store, the latest movies are usually placed on the shelves in alphabetical

order. Older movies are grouped into categories such

as Action or Comedy. The manager has to choose a set of categories and then place each movie in the most appropriate

location.

Page 2: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Scientists faced a similar challenge when they looked for a logical way to organize

the elements.

Page 3: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Mendeleev arranged the elements into rows in order of increasing

mass (not atomic #) so that elements with

similar properties were in the same column.

Page 4: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

There was a hole in this table… a missing element that had not been discovered at the time. Mendeleev predicted the properties of a missing element in his table. He said that eka-aluminum would be a soft metal with a low melting point and a density of 5.9 g/cm3.

Page 5: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Gallium is a soft metal with a melting point of 29.7°C and a density of

5.91 g/cm3.

Page 6: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

The close match between Mendeleev's predictions and the actual properties of

new elements showed how useful his periodic

table could be.

Page 7: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

In the modern periodic table, elements are

arranged by increasing atomic number (number of

protons).

Page 8: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

periodic lawthe pattern of repeating properties

displayed by elements in the periodic table

Page 9: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Groups are verticaland have similar properties

Group 1 = H through Fr

Periods are horizontalPeriod 2 = Li through Ne

Page 10: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Elements are classified as metals, nonmetals,

and metalloids

Page 11: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Metals are elements that are good conductors of

electric current and heat.

Most metals are malleable, they do not shatter when hit. Many

metals are ductile; that is, they can be drawn into

thin wires.

Page 12: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Nonmetals are elements that are poor conductors

of heat and electric current. All the gases in

the periodic table are nonmetals. The nonmetals

that are solids at room temperature tend to be

brittle. If they are hit with a hammer, they shatter or

crumble.

Page 13: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Metalloids are elements with properties that fall

between those of metals and nonmetals. For

example, metals are good conductors of electric

current and nonmetals are poor conductors of electric

current.

Page 14: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

The elements in Group 1 are called alkali metals. These metals have s1 electrons and are extremely reactive(Group 2-alkaline earth metals, Group17-Halogens, p.162)

Page 15: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Group18 noble gases. Helium s2

all others are stables2p6

Page 16: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

s, p, d, f blocks

Page 17: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Electronegativity – how much the nucleus wants the electron

Atomic radii decreases as electronegativity increases.

Page 18: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Ions- have lost or gained electrons

• Would something with a high electronegativity want to lose or gain electrons?

Page 19: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Sketch a table, and leave some space

Page 20: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Periodic Trends

Page 21: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or
Page 22: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

First ionization energy – energy needed to remove 1 electron

Page 23: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Which would take more energy to remove an electron from?

Fluorine or Oxygen

Page 24: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Electrons have a negative charge

• How does the charge of an atom change if the atom gains an electron?

• How does the charge of an atom change if the atom loses an electron?

Page 25: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

Atom vs Common Ion Radii p 178

Page 26: In a video store, the latest movies are usually placed on the shelves in alphabetical order. Older movies are grouped into categories such as Action or

• Ions with positive charges are smaller than atoms (lost electrons)

• Ions with negative charges are larger than atoms (gained electrons)