Elements and Atoms Review

What type of substance cannot be broken down into simpler substances?

• Elements

• Compounds

• Mixtures

How many elements do we know of today?

• 90

• 118

• 217

What is the smallest piece of matter that can still be identified as its element?

• Protons

• Atoms

• Nucleus

Who was the FIRST person to suggest matter was made up of atoms?

• Democritus

• John Dalton

• Dmitri Mendeleev

What particles exist within the nucleus of the atom? Choose ALL that apply.

• Protons

• Neutrons

• Electrons

Which particles have an electrical charge (positive OR negative)? Select all that apply.

• Protons

• Neutrons

• Electrons

Which particles have a mass of about 1 atomic mass unit (amu)? Select all that apply.

• Protons

• Neutrons

• Electrons

The atomic number of an element tells you how many of WHAT particles that atom has? Select all that apply.

• Protons

• Neutrons

• Electrons

An isotope of carbon has an atomic number of 6 and a mass number of 14.

How many protons does that isotope have?

An isotope of carbon has an atomic number of 6 and a mass number of 14.

How many neutrons does that isotope have?