Page 241 - Science Course 1 (Book 1)

Mo6-L6b: What are Halogens and Noble Gases?

Unlike the halogens, the only way elements in this
group react with other elements is under special
conditions in a laboratory.

Of all the elements, hydrogen 1 1.0079
has the smallest atomic mass
and is the most common H
element in the universe.

Hydrogen

Hydrogen is most often classified as a nonmetal because it has many properties like those of nonmetals.

However, hydrogen also has some properties similar to those of the group 1 alkali metals.

Under conditions on Earth, hydrogen usually behaves as a nonmetal.

Akali Metals
H Gas Nonmetals He
Li Be B C N O F Ne

Na Mg Metals Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Ti Pb Bi Po At Rn
Fr Ra Ac
Liquid

Key Concept

What are Halogens and Noble Gases?
What is the difference between halogens and noble
gases?
SUMMARY
What are Halogens and Noble Gases?
Halogens and noble gases are nonmetals.
These elements are found in group 17 and
group 18 of the periodic table.
17

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