Chemistry

Who made predictions about future elements and left spots open?

• Demitri Mendeleer

• Nostradamus
• Leonardo da Vinci
• Isaac Newton

Who reorganized the periodic table to its current form with increasing numbers?

• Albert Einstein
• Isaac Newton
• Dmitri Mendeleev
• Henry G.J. Moseley

Periods are __________. Groups are ___________.

• left, right

• horizontal, vertical

• vertical, horizontal

• vertical, sideways

What percent of the table is metals?

• 25%

• 50%

• 75%

• 100%

What kind of metals are less dense and more reactive?

• transition metals
• noble gases
• alkali metals
• alkaline earth metals

Which metals are not as dense and not as reactive? They are shiny and flimsy.

• transition metals
• noble gases
• halogens
• alkali earth metals

Which metals have a very high melting point, are very dense, and are natural in their pure form? Examples - jewelry, money, electrical wires

• transition metals

• alkali metals

• lead and zinc
• earth metals

to reflect light

• luster

• dense

• ductility

• malleability

pull thin wires

• malleability

• transition

• ductility

• luster

hit into thin sheets

• ductility

• transition

• malleability

• luster