Atomic Structure

The "Father" of the modern atomic theory. He had four statements about atoms.

The number of protons and neutrons in the nucleus of an atom.

These were produced in cathode ray tubes, and they were later found to be made of electrons.

Since an atom is neutral, the number of _?_ equals the number protons.

Subatomic particles that are in the nucleus and they have masses of 1 atomic mass unit.

The atomic masses for each element on the _?_ are average atomic masses.

All matter is composed of extremely small particles called _?_.

A chemical compound always contains the same elements in the exact same proportions by mass.

Using a periodic table, you can determine that boron (B) has an atomic number of _?_.

An atom of carbon-13 has _?_ neutrons.

Another name for hydrogen-3. It consists of one proton , two neutrons, and one electron.

A law that compares the ratio of elements in two different compounds.

Subatomic particle that has an positive charge and is located in the nucleus.

_?_ used the cathode ray tube to discover the electron and determine its negative charge

An atom of neon-20 has a mass number of _?_.

An _?_ is defined as a mass equal to one twelfth the mass of an atom of carbon-12.

Rutherford said that the nucleus was a tiny dense core and the electrons were around it.

Subatomic particle that has no electrical charge and is located in the nucleus.

If an atom of phosphorus (P) has a mass number of 31, how many neutrons does it have?

An atom of zinc-65 has _?_ electrons.

Atoms with similar atomic numbers but different mass numbers are called _?_.

Subatomic particles that have charges.

Subatomic particle that has an negative charge and travels around the nucleus.

Another name for hydrogen-1. It consists of only a proton and an electron.

Discovered evidence for the proton.

Another name for hydrogen-2. It consists of one proton , one neutron, and one electron.

Most elements occur naturally as a mixture of _?_ isotopes.

The weighted average of the atomic masses of the naturally occurring isotopes of that element.

Mass cannot be created nor destroyed in a chemical reaction.

The identity of an element is determined by the number of _?_ in the atom.

Rutherford's gold foil experiment showed that the majority of the mass of an atom is in its_?_.

_?_ determined the charge and mass of the electron with his oil-drop experiment.

_?_ performed the gold foil experiment which provided evidence for the atomic nucleus.

The number of protons in the nucleus of an atom.

Electrons revolve in orbits around the nucleus, but can jump from one orbit to another.

Ancient Greek philosopher who argued that matter was made of tiny indivisible particles.

What is the atomic number of argon (Ar) if the atom has 20 neutrons?

The Danish physicist who proposed a model that electrons revolve in orbits around the nucleus.

The term _?_ refers to the nucleus of a given isotope of an element.

You can determine the number of _?_ by subtracting the atomic number from the mass number.

An atom of nickel-59 has _?_ protons.

The purpose of a(n) _?_ was to accurately represent the experimental evidence about atoms

The model of the atom that J.J. Thompson with the electrons in a positively charged mass.

_?_ of carbon-12 is assigned a mass of exactly 12 atomic mass units (amu).

_?_ discovered the neutron.

If an atom were the size of a football stadium, the nucleus would be the size of a _?_.