Practice for atoms, half-life, and bonding

Elements that are semiconductors and are brittle solids, and are poor conductors at room temperature are ____.

• metals
• nonmetals
• metalloids
• Isotopes

What is the name of the following compound? NaCl

• Aluminum chlordie
• Magnesium chloride
• Potassium chloride
• Sodium chloride

What is the formula for the covalent bond : dioxygen decachloride?

• O2Cl2
• O2Cl10
• OCl2
• O2Cl9

Which of the following is an advantage of nuclear power plants?

• More efficient greener and less pollutants
• The costs are low.
• No accidents happen
• Wastes are not radioactive.

The process in which light nuclei combine at extremely high temperatures, forming heavier nuclei and releasing energy.

• Fission
• Chain Reaction
• Half-life
• Fusion

Which of the following is true about an atom with the charge of +1?

• It has lost 1 proton
• It has lost 1 electron
• It has gained 1 proton
• It has gained 1 electron

How many protons in an atom of Beryllium (Be)?

• 1
• 4
• 5
• 9

Based on its position in the periodic table, which element is most likely to form a negatively charged ion?

• Magnesium (Mg)
• Lithium (Li)
• Fluorine (F)
• Neon (Ne)

What is the correct formula for Sodium oxide?

• NaO
• SO
• Na2O
• S2O

A sample of element X decays to 1/16 of its original amount after 80 years. What is element X’s half-life?

• 80 Years
• 40 Years
• 20 Years
• 10 Year