Atomic Structure and Radioactivity Quiz

Match the letter that best fits Democritus

• Responsible for the discovery of the electron

• Came up with the idea of fixed electron orbitals (like planets around the sun)?

• Responsible for the confirmation of the atom based on the work of Democritus and became the founder of modern chemistry based on the idea of 'Compounds are formed by the joining of atoms of two or more elements.'

• Developed the idea of an indivisible part of matter called the 'atomos,' later called the atom

• By shooting a sheet of gold foil with a proton beam, this scientist discovered the existence of the nucleus.

Match each definition with the correct vocabulary term Atoms with the same number of protons but different numbers of neutrons

• Isomer

• Isotope

• Alloform

• Allotrope

The smallest particle of an element that retains the properties of that element

• Atom

• Proton

• Electron

• Nucleus

The weighted average mass of an element's isotopes

• Mass number

• Atomic mass

• Atomic number

• Atomic mass unit

The center-most part of an atom where the protons and neutrons are contained

• Proton

• Neutron

• Electron Cloud

• Nucleus

Ray of radiation traveling from the cathode to the anode

• Cathode ray

• Gamma ray

• Anode ray

• Mass number

States that all matter is composed of atoms

• Conservation of mass

• Rutherford mass

• Plum pudding model

• Dalton's atomic theory

The total number of protons and neutrons in a nucleus.

• Mass number

• Atomic mass

• Atomic number

• Atomic mass unit

The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

• Mass number

• Atomic mass

• Atomic number

• Atomic mass unit

Which of the following has 18 electrons? +2

• p

• P

• p+¹

• p-3