The Periodic Table of Elements

Mendeleev arranged the elements by their ________________

• proton number

• density

• melting point

• atomic mass

Elements in the same group or family have the same number of

• neutrons

• valence electrons

• electrons

• energy levels

What are the elements in group 18 (the far right) of the periodic table called?

• Alkali metals

• Alkaline earth metals

• Halogens

• Noble gases

What are the elements found along the "staircase" called? They have properties of both metals and non-metals.

• Metalloids

• Non-metals

• Transition metals

• Metals

Diagram above shows the electron arrangements of atom D and atom E. Which of the following statements is true about elements D and E?

• The boiling point of Element E is lower than Element D

• Both the elements, D and E, can conduct electricity

• Both the elements, D and E, are very soluble in water

• Both the elements, D and E, cannot combine with other elements to form compounds

Which of the following elements is most likely to have similar properties to those of sodium (Na)?

• Magnesium (Mg)

• Sulfur (S)

• Francium (Fr)

• Titanium (Ti)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which pair of properties describes the elements in Group 1?

• They are chemically stable

• They have 8 valence electrons

• They are the most reactive metals

• They are the most reactive non metals

Reactivity of halogen decreases going down the group because

• The 8th electron difficult to attract by nucleus

• Atomic size decreases down the group

• Electrons are closer to the nucleus

• Screening effect decreases

At room temperature, chlorine is...

• a yellow-green gas
• a brown gas
• a yellow-green liquid

As you move down the group, halogens' reactivity...

• increases

• decreases

• doesn't change

• shows no trend.