Question

match the vocabulary word with its definition.
number of protons in an atom
positively charged particles
substance that contains only one type of atom
negatively charge particles
atoms that have different numbers of neutrons

1. atomic number
2. element
3. isotope
4. proton
5. electron

Explanation:

• The atomic number is defined as the number of protons in an atom.
• Protons are positively charged particles.
• An element is a substance that contains only one type of atom.
• Electrons are negatively charged particles.
• Isotopes are atoms that have different numbers of neutrons.

Answer:

1. atomic number: number of protons in an atom
2. proton: positively charged particles
3. element: substance that contains only one type of atom
4. electron: negatively charge particles
5. isotope: atoms that have different numbers of neutrons