Atomic Theory

The first person to discover the existence of subatomic particles.

Who discovered the neutron?

The letter _____ is used to represent the mass number of an atom.

Who is the scientist was able to provide an explanation for the photo-electric effect?

The quantum theory was proposed by _____.

An ion of potassium (K) contains 24 electrons. What is the charge of this ion?

Who stated that energy is emitted in small packets called quanta or photons?

Known as the "Father of the Modern Atomic Theory."

The letter “Z” is used to represent the _____ of an atom.

What is the mass number of a Al³⁺ ion that contains 18 neutrons?

_____ designed the Gold Foil experiment.

This device was used to discover _____.

According to Planck’s equation, the energy and frequency of a wave are_____ related.

An ion that has more protons than electrons will have a _____ charge.

What information was obtained from this experiment?

_____ was able to determine the atomic number of each element is unique to that element.

Who provided the missing information Thomson needed to calculate the mass of an electron?

Proposed the “plum pudding” model of the atom that was later proven to be incorrect.

The cathode ray tube led to the discovery of the _____.

Who proposed that atoms combine in whole number ratios to form compounds?

The _____ was discovered by Eugen Goldstein.

Observed that uranium exposed sealed photographic film that was stored in a desk drawer.

A neutron has a mass about the same as a _____.

How many electrons does a S^2- ion contain?

A negatively charged ion is called a(n) _____.

The neutron was discovered by _____.

Isotopes have the same number of _____, but a different number of _____.

What experimental apparatus was used by Thomson to discover isotopes?

This individual believed that matter was continuous and composed air, fire, water and earth.

Which of the following parts of Dalton's Atomic Theory is no longer considered to be correct.

This individual first observed the phenomenon of radiation but could not explain what it was.

The Greek letter λ is used to represent _____.

The Law of Definite Proportions was proposed by _____.

_____ proposed a 5 part atomic theory.

His views were accepted for over 2000 years even though they were proven later to be incorrect.

An ion of sodium (Na) has a charge of 2⁺. What must be the mass number of this ion?

Through extensive research with radioactivity, this individual discovered the element Polonium.

An anion contains _____ electrons than protons.

Who proposed the first atomic theory?

_____ developed the Law of Conservation of Mass based on his experimental observations.