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
Involved in the creation of the first transuranium elements, atoms produced in a laboratory.		John Newlands
		Johann Dobereiner

3

2

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

1

3

2

Draggable item		Corresponding Item
Nonmetals that are nonreactive; elements that have color when electrified in a light tube		Alkali Metals
Have 1 valence electron; metals that should not touch bare skin because they react quickly with water		Transition Metals
Form ions with a charge of -1; nonmetals that are very reactive; each element has a distinct color; used as disinfectants

1

1

1

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

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