periodic table of elements vocab Flashcards
Anything that has mass or takes up space.
Matter
The smallest piece of an element that still has properties of that element.
Atom
A substance that cannot be broken down into a simpler substance by ordinary means. Example: hydrogen.
Element
Contains more than one element or compound spread among each other. Mixtures have the properties of the substances they are made of. Mixtures can be separated without a chemical change, for example by filtering.
Mixture
Made of two or more different kinds of atoms joined together (by a chemical reaction). Compounds have properties that are different from those of the elements they are made of.
Compound
Change where a physical property of matter is altered, but the substance remains the same kind of matter.
Physical change
Change matter undergoes when it turns into a new substance.
Chemical Change
Elements are arranged in order by their atomic number. The atomic number represents the number of protons in the nucleus of the atom/element.
Atomic Number
The number of protons and neutrons in the nucleus of an atom. (rounded to the nearest whole number for our class.)
Atomic Mass (weight)
A positively charged subatomic particle inside the nucleus of an atom.
Proton
A neutral subatomic particle inside the nucleus of an atom.
Neutron
A negatively charged subatomic particle is found outside of the nucleus of an atom.
Electron
The center of an atom is where protons and neutrons are located and contain the majority of mass for an atom.
Nucleus
7 horizontal rows on the periodic table where elements are arranged gradually and predictably based on their atomic number.
Period (on the Periodic Table of Elements)
18 vertical columns on the periodic table where elements are arranged according to similar physical and chemical properties they share within a given group.
Group (on the Periodic Table of Elements)
