02 - Periodic Table Notes

What varies across a period in the periodic table?

• Physical properties

• Chemical properties

• Atomic mass

• Atomic number

What is a property of solid nonmetals?

• Malleable

• Ductile

• Brittle

• Flexible

What do nonmetals tend to do in reactions with metals?

• Lose electrons to form positively charged ions

• Gain electrons to form negatively charged ions

• Share electrons to form neutral molecules

• Remain unchanged

What are metalloids?

• Elements that exhibit properties of both metals and nonmetals

• Elements that are only metals

• Elements that are only nonmetals

• Elements that are gases at room temperature

Which of the following elements is commonly recognized as a metalloid?

• Boron

• Oxygen

• Helium

• Sodium

Halogens are found in which group of the periodic table?

• Group 1

• Group 2

• Group 17

• Group 18

How many valence electrons do alkali metals have?

• 0

• 1

• 2

• 3

Which of the following statements is true about alkaline earth metals?

• They have 1 valence electron.

• They are less reactive than alkali metals.

• They are softer than alkali metals.

• They are gases at room temperature.

How many valence electrons do alkaline earth metals have?

• 1

• 2

• 3

• 4

What is a characteristic property of halogens?

• Low electronegativities

• Seven valence electrons

• High ionization energies

• Non-reactive with alkali metals