Chemistry Quiz on Atomic Structure and Properties

What is the approximate mass of a proton?

• 2 atomic mass units (AMU)

• 0.5 grams

• 1 atomic mass unit (AMU)

• 1 gram

According to the wave mechanical model, where do electrons exist?

• In a cloud based on standing waves

• In random paths

• In fixed orbits

• In the nucleus

What happens when an electron in an atom returns from a higher energy state to a lower energy state?

• The atom becomes neutral

• The atom becomes ionized

• Energy is released

• Energy is absorbed

Which elements have the most similar chemical properties?

• Elements in the same row

• Elements with the same atomic number

• Elements in the same column

• Elements with the same mass

What is a chemical property of noble gases?

• Their high melting point

• Their high density

• Their inability to react

• Their ability to react easily

How does calcium achieve a +2 charge?

• By gaining two protons

• By losing two protons

• By losing two electrons

• By gaining two electrons

What type of bond is formed between lithium and bromine in LiBr?

• Covalent bond

• Ionic bond

• Metallic bond

• Hydrogen bond

What is the main reason chemicals bond?

• To achieve high energy

• To increase their size

• To become unstable

• To achieve low energy

What happens to energy when a chemical bond is formed?

• Energy is released

• Energy remains the same

• Energy is absorbed

• Energy is destroyed

Which of the following represents a homogeneous mixture?

• A solution of salt in water

• A mixture of oil and water

• A mixture of nitrogen and oxygen gases

• A mixture of sand and iron filings