Chem Unit 6 Homework 1

3

Match the work to the scientist who was the first to propose the concept or to conduct the work.

Draggable item		Corresponding Item
Organized elements by mass and properties and predicted properties for elements that seemed to be missing from his arrangement.		John Newlands

3

2

Identify the sets of elements by the type of ion formed. 

1

number of neutrons

mass number

atomic number

atomic weight

3

2

Draggable item		Corresponding Item
Metals that are found in items that we touch such as jewelry, coins, and utensils		Alkali Metals
Nonmetals that are nonreactive; elements that have color when electrified in a light tube		Transition Metals
Have 1 valence electron; metals that should not touch bare skin because they react quickly with water

1

They have the same number of isotopes.

They have the same number of neutrons.

They have the same number of energy levels.

They have the same number of valence electrons.

1

The Octet Rule

The Noble Notion

The Law of Triads

The Law of Octaves

1

Draggable item		Corresponding Item
Highly reactive, colorful nonmetals		Noble Gases
Gases that have few known chemical reactions		Alkali Metals
Highly reactive, dangerous metals		Halogens

Draggable item		Corresponding Item
Organized elements by mass and properties and predicted properties for elements that seemed to be missing from his arrangement.		John Newlands
Assigned an atomic number to each element which was later recognized as the number of protons.		Johann Dobereiner
Law of Octaves devised after arranging elements by atomic weight.		Henry Moseley
Involved in the creation of the first transuranium elements, atoms produced in a laboratory.		Dmitri Mendeleev
Recognized that the middle element in a group of 3 similar elements is the mathematical average of the other two in weight and density.		Glenn Seaborg