Atoms & Periodic Table Flashcards
(35 cards)
Atom
The smallest particle into which an element can be divided and still be the same substance.
Atom Charge
Neutral/no charge
Nucleus
The tiny extremely dense, positively charged region in the center of an atom. (Has Protons and Neutrons)
Protons
The positively charged particles in the nucleus (CANNOT CHANGE THE AMOUNT OF PROTONS)
Neutrons
The particles in the nucleus that have no charge.
Electrons
The negatively charged particles found in all atoms. (Virtually no mass)
Quarks
The smaller particles that make up protons and neutrons.
Quark Charge
Neutral/No charge
Isotope
An atom that has a different number of neutrons than usual. (Almost every atom)
Ion
An atom that has a different number of electrons than usual.
An-Ion
Negative/gained electrons
Cat-Ion
Positive/lost electrons
Electron Energy
Any of the several different regions in which electrons travel about the nucleus.
Valence Shell
The outermost energy level around the nucleus.
Valence Electrons
Electrons which are only found in the valence shell. (Atomic number -2)
Atomic Mass Unit
The SI unit used to express the masses of particles in an atom.
Atomic Number
The number of protons in the nucleus.
Mass Number
The sum of the protons and neutrons in an atom.
Atomic Mass
The weighted average of the masses of all the naturally occurring isotopes of an element.
Metals
Found to the left of the zigzag line. (Solid at room temp, shiny and malleable, good conductor.)
Non-Metals
Found to the right of the zigzag line. (Most gasses at room temp, not malleable or shiny, poor conductors.)
Metalloids
Also called semiconductors, found at the border of the zigzag line. have properties of both metals and non metals.
Groups
Vertical columns of the elements on the periodic table. (Top to bottom.)
Periods
Horizontal rows of elements on the periodic table. (Side to Side)