Atoms

The positive particles of an atom are ___________.

• electrons

• protons

• neutrons

The center of an atom where its neutrons and protons are is called the _____________.

• nucleus

• electron cloud

• center

An atom is made up of protons, neutrons, and electrons.  Which is the smallest subatomic particle?

• Proton
• Neutron
• Electron
• Idontknowatron

Each row in a periodic table is called a 

• Group
• Period
• Row
• Column

Each column in the periodic table is called a 

• period
• group
• cluster
• unit

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Which is an electron?

• A
• B
• C

UP and DOWN columns on the periodic table are

• groups

• periods

SIDE TO SIDE rows on the periodic table are

• groups

• periods

How many electrons does Si contain? (click to see image)

• 14
• 28
• 2
• 4