Atomic Theory & Structure

Front

What did Niels Bohr propose about the arrangement of electrons in an atom?

Back

Electrons are found in specific orbits.

Front

What is a defining characteristic of an element in terms of protons?

Back

An element will always have the same number of protons.

Front

What significant discovery did Ernest Rutherford make regarding atomic structure?

Back

Rutherford discovered the nucleus.

Front

Define an isotope in terms of protons and neutrons.

Back

An isotope is the same element, with the same number of protons, but different numbers of neutrons.

Front

Which subatomic particle does not contribute to the mass of an atom?

Back

Electron.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

How do you calculate the atomic mass of an element?

Back

The atomic mass is calculated by adding the number of protons and neutrons in the nucleus.

Front

What is the significance of the atomic number of an element?

Back

The atomic number indicates the number of protons in the nucleus and defines the element.