The Periodic Table

Halogens are all gases.

Helium is an inert gas that does not tend to chemically interact, it is found in group ..........

Helium has .................. valence electrons. It is found in group 18.

The following element key shows the .............. for number 2

In the periodic table, group 2 elements are called ..............................

The following element key shows the .............. for number 3

Transition metals are the most active metals.

..................... is a semiconductor.

Oxygen (O) is found in group 16 in the periodic table so, it has ..................valence electrons

Chlorine (Cl) is found in group 17 so it has ....... valence electrons.

A material that is ................ can be drawn into a wire.

The modern periodic table is arranged in order of increasing atomic number.

The only metal that exists as a liquid at room temperature is ........................

The highly reactive nonmetals of Group 17 are called the

Mendeleev arranged his periodic table in order of increasing atomic number.

The following element key shows the .............. for number 4

Nonmetals are all solids.

Atoms of nonmetals usually lose electrons when they combine with other atoms.

Substances that can carry electric current under some conditions but not under others are called ...

The following element key shows the .............. for number 1

The most reactive metals are .............

Metals are found at the right side and the middle of the periodic table.

Alkaline earth metals are more reactive than alkali metals.

In the periodic table, group 1 elements are called ..............................

The halogen that exists as a liquid at room temperature is ......................