This refers to the number of protons of an element.

• Atomic Number

• Mass Number

• Atomic Weight

• Group

What is the atomic number of Helium (He)?

• 1

• 2

• 3

• 4

Is Helium (He) a metal, non-metal or a metalloid?

• Metal

• Non-metal

• Metalloid

• I don't know

Which is heavier: Helium (Z=2) or Boron (Z=5)?

• Helium

• Boron

• Same weight

• I don't know

Is Helium a representative element, transition metal, or an inner transition metal?

• Representative Element

• Transition Metal

• Inner Transition Metal

• I don't know

How many valence electrons does Krypton (Kr, Z=36) have?

• 5

• 6

• 7

• 8

Which among these is a METALLOID?

• Aluminum (Al)

• Silicon (Si)

• Phosphorus (P)

• Sulfur (S)

Which among these is a METAL?

• Aluminum (Al)

• Silicon (Si)

• Phosphorus (P)

• Sulfur (S)

Which element has an atomic number = 16?

• Silicon

• Sulfur

• Strontium

• Selenium

What can you say about the arrangement of the periodic table of elements?