The Periodic Table and Electron Configuration (HN)

How many periods are there in the periodic table of elements?

• 7

• 18

• 118

• dont know

How many groups are there?

State the number of valence electrons in an atom of: Sulfur

State the number of valence electrons in an atom of: Calcium

State the number of valence electrons in an atom of: Chlorine

State the number of valence electrons in an atom of: Arsenic

Give the Chemical symbol and Element name for the elements that correspond to these atomic numbers. 90

• Th, Thorium

• Ar, Argon
• Kr, Krypton
• Th, Thorium

Tags

NGSS.HS-PS1-1

Give the Chemical symbol and Element name for the elements that correspond to these atomic numbers. 18

• Ne, Neon
• Ar, Argon
• Kr, Krypton
• Th, Thorium

Which of the following pairs of elements belong to the same period?

• Na and Cl

• Na and Li

• Na and Cu

• Na and Ne

Which of the following pairs of elements belong to the same group?

• H and He

• Li and Be

• C and Pb

• Ga and Ge