Chemistry B - 10.1: The Nucleus Quiz

What do nuclear reactions involve?

• Energy from sound

• Changes in the nucleus of atoms

• Movement of molecules

• Electron transfers only

What is the atomic number?

• Mass number

• Number of protons in a nucleus

• Number of electrons

• Number of neutrons

What is the mass number?

• Number of neutrons

• Sum of protons and neutrons

• Atomic number only

• Number of electrons

How many neutrons does H-3 have?

• 1

• 0

• 2

• 3

How many protons does C-14 have?

• 6

• 8

• 14

• 12

What are isotopes?

• Different elements

• Atoms with the same number of protons but different numbers of neutrons

• Unstable molecules

• Ions

What does H-1 represent?

• Hydrogen with 1 neutron

• Hydrogen with 1 proton and 0 neutrons

How is an isotope usually written?

• Mass number only

• Element name or symbol followed by mass number

• Electron count and name

• Atomic number first

What is the nucleus compared to the size of the electron cloud?

• 10 times smaller

• About 10,000 times smaller

• Larger than cloud

• Same size

What is a neutron star?

• A star of gas and plasma

• A dense star composed only of neutrons

• A type of galaxy

• A black hole