Chapter 2 Flashcards
the fundamental building block of all matter (solid, liquid, gas, and plasma)
Atom
Electrical property of some subatomic particles
Opposite _____ attract and like _____ repel
Charge
A negatively charged subatomic particle that occupies orbitals around the atomic nucleus
Electron
Positively charged subatomic particles are found in the nucleus of all atoms
Proton
Uncharged subatomic particles found in the atomic nucleus
Neutron
Number of protons in the atomic nucleus
Atomic Number
Total number of protons and neutrons in the nucleus of an element’s atoms
Mass number
A pure substance that consists only of atoms with the same number of protons
Element
Forms of an element that differ in the number of neutrons their atoms carry
Isotopes
Isotope with an unstable nucleus, such as carbon 14
Radioisotope
Process by which atoms of a radioisotope spontaneously emit energy (radiation) and subatomic particles when their nucleus disintegrates
Radioactive decay
Molecules with radioisotopes attach
Used in research and clinical testing in living organisms to study the way elements move through a system
Radio Isotope Tracers
Distribution of electrons in an atom
Shell model
solitary atoms that have unpaired electrons
Free radical
Atoms that carry a charge because they have an unequal number of protons and electrons
Ions
Attractive force that arises between two atoms when their electrons interact
Chemical bond
Group of two or more atoms joined by chemical bonds
Molecule
Molecule that has atoms of more than one element
Compound
Strong mutual attraction formed between ions of opposite charge
Ionic Bond
Any separation of charge into distinct positive and negative regions
Polarity
Two atoms sharing a pair of electrons
Multiple ______ bonds may form between two atoms
Covalent Bond
Atoms share electrons unequally
Polar Covalent Bond
Atoms share electrons equally
Nonpolar Covalent Bond
An attraction between a covalently bonded hydrogen atom and another atom that is part of another covalent bond
Hydrogen Bond
Liquid that can dissolve other substances
Solvent
A substance that dissolves easily in water
Hydrophilic
A substance that resists dissolving in water
Hydrophobic