Elements Flashcards
Substance that cannot be broken down chemically to a simpler substance
Element
Important properties of an element
It’s state at room temp. And the way it combines with other elements.
The smallest unit of an element that has that element’s properties.
An atom
The center of an atom
It’s nucleus
An atom’s nucleus contains particles called protons that have a positive charge and particles called
Neutrons which have no charge
Negatively charged particles called
Electrons move around the nucleus
Because an atom has ten same number of…
Protons and electrons , the atom has no overall change
The number of protons in an atom is that atom’s
Atomic number
An atom’s protons and neutrons have about the same mass, which is one
Atom mass unit, or a.m.u
The mass of all particles of an atom added together is
Its atomic weight
Two or more atom’s joined into a single particle from a…..
Molecule
Molecules have properties that are different than the
Elements that form them.
Dmitri Mendeleev created the…
Periodic table of elements
The table’s columns group elements according to their
Properties
In space, the most common elements are..
Hydrogen and helium
