Chapter 17 IPC study guide

the __ often occurs in nature as uncombined elements.

• alkaline earth metals

• alkali metals

• actinide series

• transitional elements

A synthetic element that is used in smoke detectors

• americium

• sodium

• technetium

• aluminum

Bromine is the only halogen and nonmetal that is a__ at room temperature

• solid

• liquid

• gas

• semiconductor

The bonding that occurs when positively charged ions are surrounded by a cloud of electrons is called a__

• bonding

• ionic

• covalent

• metallic

an allotrope of carbon that is soft and can be used as a lubricant is---

• dimond

• graphite

• sand

• silicon

what element in the oxygen group is needed in trace amounts in your diet

• selenium

• tellurium

• polonium

• sulfur

different forms of the same element that have different properties because of different atom arrangements are called--

• allotropes

• carbons

• graphites

• halogens

which of the following elements is not in the iron triad?

• cobalt

• copper

• nickle

• iron

at room temperature most metals are

• solids

• radioactive

• liquids

• gases

the most unreactive group of elements is the

• halogens

• noble gases

• alkali metals

• transitional elements