Period Trends and Chemical Reactions

Multiple Choice

The number at the top of each square indicates the........

• Number of electrons

• Number of Protons

• Number of Neutrons

• The Mass

Dropdown

The number at the bottom is the average ​

Select answer

_​

Multiple Select

Atomic radius is measured in ....... (choose all that apply)

• millimeters

• centimeters

• picometers

• angstroms

Multiple Choice

What is the energy required to remove one electron from a neutral atom of an element in the gaseous state?

• mechanical energy

• magnetic energy

• electromagnetic energy

• ionization energy

Multiple Choice

Reactivity is....

• the rate in which a chemical substance tends to undergo a chemical reaction

• how a chemical substance reacts

• the chemical properties of a substance before a reaction

• the number of valence electrons that remain after a chemical reaction