Unit 2 Review

How did Mendeleev organize the periodic table

• atomic mass

• atomic number

• protons

• mass number

What family is Barium (Ba) part of?

• alkali metals

• alkaline earth metals

• transition metals

• halogens

Which two elements will have the most similar properties?

• Carbon and Oxygen

• Cobalt and Magnesium

• Sodium and Rubidium

• Argon and Chlorine

Answer explanation

Elements in the same group will have the most similar properties!

What happens when an electron moves from its excited state back down to its ground state?

• it absorbs energy

• it releases energy as light

• nothing

• it has more energy

What family is Krypton found in?

• alkali metals

• halogens

• transition metals

• noble gases

How many valence electrons does Oxygen have?

• 8

• 6

• 16

• 10

What is the electron configuration for Br?

• 1s²2s²2p⁶3s²3p⁵

• 1s²2s²2p⁶3s²3p⁶4s²4d¹⁰4p⁵

• 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵

• 1s²2s²2p⁵

What is the third element in the actinide series?

• Promethium

• Protactinium

• Actinium

• Rutherfordium

Which metal is the only metal that is a liquid at room temperature?

• Bromine

• Gold

• Mercury

• Gallium

Which is the most abundant on the periodic table?

• metals

• nonmetals

• metalloids