Periodic table
Unique substances that cannot be broken down into simpler substances by traditional chemical means.
What is an element?
A negatively charged subatomic Particle
What is an electron?
Forms of the asme atom that differ in the number of neutrons they possess.
filter paper treated with a natural water-soluble dye for use as a pH indicator.
What is Litmus?
This term denotes isotopes that experience radioactive decay due to their unstable nature.
What are Radioisotopes?
Anything that has mass and takes up space.
Anything that has mass and takes up space.What is matter?
An uncharged subatomic particle
What is a Neutron?
The calculated mean of the mass for an elements naturally occurring isotopes.
What is the Atomic Mass?
an inverse logarithm ranging from 0 to 14. Anything with a pH lower than 7.0 is acidic. Anything with a pH above 7.0 is alkaline.
What is the pH scale:
Created in 1869 by Dimitri Mendalev this chart organizes elements into groups based on shared chemical properties.
What is the Periodic Table?
This number describes the number of protons in the nucleus of on atom of an element.
What is the atomic number?
The center of the atom containing protons and neutrons.
the Nucleus
This term denotes the ability for elements to chemically bond with each other.
What is Chemical Reactivity?
a substance that increases hydrogen ions concentration in a solution, usually by having one of its hydrogen atoms dissociate.
What is an Acid?
The outermost electron shell.
What is the Valence shell?
This number describes the number of protons and neutrons present in an atoms nucleus.
This term describes two or more elements that are chemically bonded together.
What are Molecules?
a substance that provides either hydroxide ions or other negatively charged ions that combine with hydrogen ions, reducing their concentration in the solution and thereby raising the pH.
What is a Base?
This law states that with the exception of the innermost electron shell atoms are more energeticaly stable when they have eight electrons in their valence shell.
What is the octet rule?
These 7 elements are the most common in living organisms please state their names and atomic number.
Oxygen (8), Carbon (6), Hydrogen (1), Nitrogen (7), Phosphorus (15), Sodium (11), Chlorine (17).
The smallest unit of matter that still retains the properties of an element.
What is an atom
An atom that has a charge either from exess of protons or electrons.
What is an Ion?
a way to express the amount of a substance.
What are Moles?
This law states that the number of atoms before and after a chemical reaction should be equal, such that no atoms are, under normal circumstances, created or destroyed.
What is the Law of the conservation of matter?