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Chapter 4

INTRO TO COLLEGE CHEMISTRY-CHM 2025
PROF. LONGMIRE-PEREZ, M.S.
Across
Group 8A elements which are chemically unreactive.
The elements in the middle of the periodic table whose properties tend to be less predictable based simply on their position in the periodic table.
The percentage amount of each isotope of an element in a naturally occurring sample of the element.
The unit commonly used to express the masses of protons, neutrons, and nuclei.
A positively charged nuclear particle.
A theory stating that most of the atom's mass and all of its positive charge are contained in a small, dense nucleus.
Group 7A elements which are very reactive nonmetals.
The elements in found in the middle of the periodic table.
Elements that tend to lose electrons in chemical reactions found at the left side and in the center of the periodic table.
The number of protons in the nucleus of an atom.
Elements that tend to gain electrons in chemical reactions found at the upper right side of the periodic table.
Group 1A elements which are highly reactive metals.
Down
A nuclear particle with no electrical charge and nearly the same mass as a proton.
A negatively charged ion.
A one- or two-letter abbreviation for an element.
An atom that has gained or lose one or more electrons so that it has an electric charge.
The energetic particles emitted from the nucleus of an atom when it is undergoing a nuclear process.
The sum of the number of neutrons and protons in an atom.
Groups 1A-8A on the periodic table.
Group 2A elements which are fairly reactive metals.
A positively charged ion.
A negatively charged particle that occupies most of the atom's volume, but contributes almost none of its mass.
Those elements that fall along the boundary between the metals and nonmetals in the periodic table.
The mass of the atoms in an element.
One of two more atoms with the same number of protons, but different numbers of neutrons.
The part of the cell that contains the genetic material.