Atomic Theory & Periodic Table

Vertical columns on the periodic table are called ____.

• Groups
• Periods

Horizontal rows on the periodic table are called ____.

• Groups
• Periods

The number of protons in an atom is that element's _________.

• ratio number
• atomic number
• order number
• mass number

The total of the protons and neutrons is that atom's ______.

• atomic number
• ratio number
• atomic mass
• order number

Elements in group _______ are the most reactive metals.

• Noble gases/group 18
• Halogen/group 17
• Transitional metals/ groups 3-12
• Alkali metals/ group 1

Metallic properties decrease as from group 1 to group 18 on the periodic table.

• True
• False

The atomic number increases from group 1 to group 18 on the periodic table.

• True
• False

Which element would make a good conductor?

• copper
• oxygen
• neon
• helium

Opposite charges will ___________.

• repel
• attract
• attract and repel
• not exist

What is the charge of an electron?

• positive
• no charge
• negative
• positive and negative, depending on the placement