The Periodic Table Explorer

What is the atomic number of Oxygen (O)?

• 16

• 8

• 12

• 14

Which element has the symbol "Na"?

• Nitrogen

• Neon

• Sodium

• Nickel

As you move from left to right across a period in the periodic table, what generally happens to the atomic radius?

• It increases

• It decreases

• It remains constant

• It first decreases, then increases

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which group in the periodic table is known for having elements that are all gases at room temperature?

• Alkali metals

• Alkaline earth metals

• Halogens

• Noble gases

What is a characteristic property of elements in the halogen group?

• They are good conductors of electricity.

• They are highly reactive nonmetals.

• They are noble gases.

• They are all metals.

Who is credited with creating the first periodic table?

• Isaac Newton

• Albert Einstein

• Dmitri Mendeleev

• Marie Curie

What unique property do noble gases share?

• They are highly reactive with water.

• They have high melting points.

• They are colorless, odorless, and monatomic gases at room temperature.

• They are all solid at room temperature.

Which element has the atomic number 79?

• Gold (Au)

• Silver (Ag)

• Iron (Fe)

• Copper (Cu)

What trend is observed in the electronegativity of elements as you move from left to right across a period?

• It decreases

• It increases

• It remains the same

• It first increases, then decreases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which group of elements is known for being good conductors of electricity?

• Noble gases

• Halogens

• Transition metals

• Alkali metals