Atomic Number, Mass Number and Atomic Mass

An atom is basically made of tiny subatomic particles, these are ____________.

• Proton, Neutron, Electron

• Proton, Neutron, Electron, and the Nucleus

• Nucleus and the Electron Cloud

• Proton, Neutron, Electron, Positron, Quarks

Tags

NGSS.MS-PS1-1

Thomsons' experiment determined the existence of the electron. What equipment was used in the experiment?

Rutherford's experiment proved that atoms have a nucleus containing most of atom’s mass. In the experiment, what material was used to deflect the particles?

This indicates the number of protons in the nucleus of an atom. They identify the element.

The elements in the periodic table are arranged according to increasing _____________.

• Atomic Number

• Atomic Mass

• Electronegativity

• Mass Number

This is equal to the number of protons + neutrons, in a given atom.

The mass number can vary for the same element, if the element has different numbers of neutrons.

When this happens, these forms of an element are called ________.

This is the weighted AVERAGE of the masses of ALL the natural occurring isotopes.

Given the element Potassium (K), what is Atomic number?

These elements have the same atomic number, but different mass numbers.