Atoms and the Periodic Table

Matter

Anything that takes up space and has mass.

Atom means…

un-cuttable. (Although this is really not true.)

Atoms are…

The building blocks of matter and the smallest piece of an element that still behaves like an element

Atoms are made of smaller pieces called…

Subatomic particles

Nucleus

The dense center of an atom

Number of protons =

Atomic Number

Number of electrons =

number of protons, if the atom is not charged.

Number of Neutrons =

Mass number - atomic number

Periodic table is arranged according to… rather than weight

Atomic Number

The Periodic Table contains… elements

118

Atomic number =

The number of protons an atom of the element has.

Atomic mass =

The weighted average mass of all the forms of the element.

The Periodic table is organized into horizontal rows called…

periods

There are… periods in the Periodic table

7

There are… vertical groups/families

8

Elements in the same group have the same number of…

Valence electrons, which results in similar chemical properties.

Valence electrons

Electrons in the outermost energy level of an atom.

Elements

substances that are made up of only one kind of atom.

Elements cannot be…

chemically broken down into something simpler.