The Structure of Atom

Question 1

• Is the number of protons in an atom.
• Atomic number of an element is equal to the number of protons present in the nucleus of its atom.
• Also referred to as atomic weight, average atomic mass, relative atomic mass.

Answer 1

Atomic Number

Question 2

The number of protons and neutrons in an atom.

Answer 2

Mass Number or Atomic Mass

Question 3

Atoms that have the same number of protons but different number of neutrons. Chemically alike but with varying mass numbers. Isotopes have the same chemical properties but slightly different physical properties.

Answer 3

Isotope

Question 4

Does not undergo radioactive or nuclear decay.

Answer 4

Stable Isotope

Question 5

Undergoes radioactive or nuclear decay. Also known as Radioisotope or Radionucleides.

Answer 5

Unstable Isotope