Lesson 12 Treneds

What can you describe by understanding the periodic table of elements?

• The history of chemistry

• Patterns in the arrangements of elements

• The number of compounds elements can form

• The colors associated with each element

What does the position of an element in the periodic table indicate?

• The atomic weight of the element

• The atomic structure of the element

• The discovery date of the element

• The melting point of the element

What can you do by comparing elements in the periodic table?

• Predict the future elements to be discovered

• Compare and contrast the properties of elements within a group

• Determine the exact atomic mass of elements

• Understand the economic value of elements

What can you analyze by contrasting different groups in the periodic table?

• The reactivity of noble gases

• The age of elements

• The properties between groups

• The uses of elements in industry

What is a valence shell?

• The innermost energy level/orbit

• The second energy level/orbit

• The outermost energy level/orbit

• The core of an atom

What is a valence electron?

• An electron in the innermost orbit

• An electron in the nucleus

• An electron in the valence shell

• A positively charged particle in the valence shell

Within a period in the periodic table, all elements have the same number of what?

• Protons

• Neutrons

• Energy levels/shells/orbits

• Electrons

Within a group in the periodic table, all elements have the same number of what?

• Protons

• Neutrons

• Valence electrons

• Atomic mass

What is the meaning of "reactive" as used in the context of the periodic table?

• Highly stable

• Not stable

• Highly inert

• Perfectly balanced

How does an atom achieve "stability"?

• By losing all electrons

• By having a full valence shell

• By having a full core shell

• By sharing all its protons