Atoms, Ions, & Isotopes

What does the atomic number of an element represent?

• The number of neutrons in the nucleus

• The number of protons in the nucleus

• The number of electrons in the outer shell

• The total number of subatomic particles

Where can you find the atomic mass of an element on the periodic table?

• Next to the element’s symbol

• Above the element’s symbol

• Below the element’s symbol

• To the left of the element’s name

Which subatomic particle is found in the nucleus of an atom?

• Electron

• Proton

• Neutron

• Both B and C

What is the charge of a proton?

• Positive

• Negative

• Neutral

• Variable

What is the definition of an atom?

• A positively charged particle

• The smallest unit of an element that retains its properties

• A negatively charged particle

• A group of molecules

Which of the following best defines an ion?

• An atom with a different number of protons

• An atom with a different number of electrons

• An atom with a different number of neutrons

• A molecule with a positive charge

What is an isotope?

• An atom with a different number of protons

• An atom with a different number of neutrons

• An atom with a different number of electrons

• A molecule with a negative charge

Which number is unique for every element and is used to identify it?

• Atomic mass

• Atomic number

• Number of neutrons

• Number of electrons

Which subatomic particle has no charge?

• Proton

• Electron

• Neutron

• Positron

What is the symbol for the element with atomic number 8?

• O

• N

• C

• F