Chapter 16- The Periodic Table

There is a decrease in ________ across a period.

________-- decreases across a period, increases down a group.

________: welding, ________ tents and tanks.

The list of elements arranged in order of increasing proton number.

Vertical column in a periodic table.

Horizontal row in a periodic table.

• same valency/number of valence electrons

• same number of shells

• gradual change from metals to non-metals

• lose electrons to form cations

• gain electrons to form anions

• can either gain or lose electrons

• are stable and do not react

• decreases across a period, increases down a group

2Na + 2H20 2NaOH + H20

2Na + Cl2 2NaCl

density, reactivity, softness

Melting and boiling points

2NaBr + Cl2 2NaCl + Br2

Melting and boiling points, density, colour (darker)

Reactivity, state (gas to solid)

Boiling point, mass

for filling balloons and airships

for filling tungsten bulbs

used in lights and advertising signs

used in vehicle headlamps

to provide inert atmosphere for processes like welding

welding, oxygen tents and tanks

The set of metallic elements occupying a central block in the periodic table.

The name given to Group I metals in the periodic table.

The name given to Group VII elements in the periodic table.