PEC 17-3 Mixed Groups

Which of the Group 13 elements is not a metal?

• boron
• aluminum
• gallium
• indium

Substances that conduct an electric current only under certain conditions are most likely to be ____.

• metals
• metalloids
• noble gases
• nonmetals

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

• allotropes
• carbons
• graphites
• halogens

An allotrope of carbon that is soft and can be used as a lubricant is ____.

• diamond
• graphite
• sand
• silicon

An allotrope of carbon that is hard and is often used in jewelry is ____.

• diamond
• graphite
• quartz
• silicon

All synthetic elements are ____.

• liquids
• needed by human body
• radioactive
• useful in making plastics

Any element with an atomic number greater than that of uranium is a(n) ____.

• halogen
• lanthanide
• transition element
• transuranium element

The noble gases are in ____.

• Group 18
• Group 1
• Group 13
• Group 2

Elements that lie along the stair-step line of the periodic table are ____.

• liquids
• metals
• metalloids
• radioactive

What two elements are used with other metals to lower their melting points?

• antimony and carbon
• bismuth and carbon
• antimony and bismuth
• arsenic and antimony