1 Atoms of the same element with different numbers of neutrons are defined as: o
neutrons
O
isotopes
O
elements
O
compounds

1.2. 1. Basic principles. Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."