science-periodic table

How many valence electrons does Helium (A.NO=2) have?

• 1

• 2

• 3

• 4

How many energy levels are there Aluminum (#13)

• 1

• 2

• 3

• 4

Which element has a complete OUTER shell?

• Sodium

• Krypton

• Tin

• Lead

what is a group on the periodic table?

• Broken Substance
• Rows
• columns
• The weeknd

what is a period on the periodic table?

• group
• column
• Row
• the weeknd

What does the Atomic number tell you about an element?

• Its favorite number
• Protons and Electrons
• Protons
• Neutrons

How many valence electrons does lithium (A.NO=3) have?

• 1

• 2

• 3

• 4

Who invented the Periodic Table?

• Mendeleev

• Bohr

• Lewis

• Democritus