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Vocabulary Review: Atomic Theory & Structure

Across
Two or more atoms of the same element having different atomic masses as a result of having a different number of neutrons are said to be called this.
The normal, expected location of an electron in a neutral atom.
When an electron absorbs energy, it "jumps" to a higher orbital and is said to be in this state.
One of more than 110-known fundamental building blocks of matter. These particles cannot be broken down by chemical means.
A unit of measurement equivalent to the mass of a single proton.
A positively-charged subatomic particle having a mass of 1 AMU and located in the nucleus of an atom.
A characteristic pattern of light emitted from a particular element when excited electrons return to the ground state, releasing energy as light in the process.
Dmitri Ivanovich Mendeleev O.S. 27 January was a Russian chemist and inventor. He formulated the Periodic Law, leading to the creation of this important document used by scientists around the world.
Electrons not found in the valence orbital are said to be this type of electron.
The earliest known scientist-philosopher to have theorized the existence of micro scale particles that make up matter. He called these particles "atomos"
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
The sum of the masses of the subatomic particles found in an atom - expressed in AMU.
This scientist laid the foundation for modern atomic theory. Through his electrolysis experiment, he determined that atoms combined to form molecules, and that elements cannot be broken down by chemical means.
This scientist conducted the Gold Foil Experiment, which proved that atoms contain a nucleus and are largely made up of empty space.
These type of electrons are found in the outermost orbital of an atom and are responsible for the reactivity of the atom as a whole.
Down
The modern model of the atom defines orbitals as "the most probable location of finding an electron." Orbitals are not circular in nature, but rather regions of high probability (nodes) and regions of low probability (empty space) where an electron may be found.
A neutral subatomic particle located in the nucleus of an atom, having a mass of 1 AMU and serving to "bind" the nucleus together.
The location of electrons in an atom.
This scientist performed the Cathode Ray Tube experiment, which led to the conclusion that electrons are like raisins in raisin bread, and that the atom is the bread as a whole. The "Plum Pudding Model" was born.
Particles that make up an atom including protons, neutrons and electrons.
A negatively-charged subatomic particle located outside the nucleus of an atom, having a mass of 1/1836 AMU
Equivalent to the number of protons/electrons within a neutral atom of an element.
The mass of a particular isotope of an element. This mass may be different from the mass listed on the periodic table because it may have more or less neutrons.
The scale on which molecules, atoms and subatomic particles is found.
This scientist created a model of the atom similar to planets orbiting a star. The nucleus was the star, and the planets were the orbitals.
the branch of science concerned with the investigation and measurement of spectra produced when matter interacts with or emits electromagnetic radiation.
A minute portion of matter; an individual unit of matter that could be anything from an atom to a planet depending upon established parameters.
The "center" of an atom in which scientists expect to find protons and neutrons, but not electrons.
The basic unit of a chemical element.