Basics of the Periodic Table

How did Mendeleev organize the Periodic Table of Elements?

• By shape and color

• By chemical properties and atomic mass

• By how many electrons they have

• By their atomic numbers

Elements on the periodic table go by increasing atomic number. This means the number of __________ makes an element unique and different from every other element.

• Neutrons

• Protons

• Electrons

What are valence electrons?

Evaluate responses using AI:

OFF

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which group contains diatomic compounds?

• Group 2 - Alkaline Earth Metals

• Group 18 (8A) - Noble Gases

• Group 1 - Alkali Metals

• Group 17 (7A) - Halogens

Bromine has chemical properties most similar to...

• Fluorine

• Krypton

• Potassium

• Mercury

Which element below is in the same period as chlorine (Cl)?

• Helium (He)

• Magnesium (Mg)

• Gold (Au)

• Carbon (C)

Which element below is in the same family as neon (Ne)?

• Krypton (Kr)

• Gold (Au)

• Fluorine (F)

• Sodium (Na)

Which element below is in the same group as iodine (I), and the same period as sodium (Na)?

• Calcium (Ca)

• Argon (Ar)

• Chlorine (Cl)

• Boron (B)

The following are properties of an unknown element. 1.Reacts with oxygen

2.Has a silver metallic luster

3.Has a low melting point

Which chemical family would this element most likely belong to?

• Metalloids

• Alkaline earth metals

• Alkali metals

• Transition metals

Tags

NGSS.MS-PS1-5

The following are properties of an unknown element. 1.Exists naturally as a diatomic gas

2.Easily accepts electrons

3.Reacts violently with alkali metals

Which chemical family would this element most likely belong to?

• Alkaline earth metals

• Metalloids

• Noble gases

• Halogens