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krafft chat 17 vocab

krafft Atomic nature

QuestionAnswer
element a substance made of only one kind of atom. Examples of elements are carbon, hydrogen, oxygen, and nitrogen
brownian motion the perpetual random movement of microscopic particles suspended in a fluid medium
molecule the smallest particle of substance consisting of two or more atoms of the same or different elements bonded together
compound a chemical substance made of atoms of two or more different elements combined in a fixed proportion
chemical formula a description that uses numbers and symbols of elements to describe the proportions of elements in a oompound or reaction
nucleus the positively charged center of an atom, which contains protons and neutrons and has almost all the mass of the entire atom but only a tiny fraction of the volume
atom the smallest particle of an element that can be identified with that element. Consists of protons and neutrons in a nucleus surrounded by electrons
nucleon the pricipal building block of the nucleus; a neutron or a proton
neutron an electrically neutral particle that is one of the two kinds of particles found in the nucleus of an atom.
protons a positively charged particle that is one of the two kinds of particles found in the nucleus of an atom
isotopes a form of an element having a particular number of neutrons in the nuclei of its atoms. Different isotopes pf a particular element have the same atomic number but different atomic mass numbers
atomic number number of protons in the nucleus of an atom
ion an atom (or group of atoms bound together) with a net electric charge, which is due to the loss or gain of electrons
shell model of the atom a model in which the electrons of an atom are pictured as grouped in concentric shells around the nucleus
periodic table a chart that lists elements by atomic number and by electron arrangements, so that elements with similar chemical properties are in the same column
plasma a fourth phase of matter, in addittion to solid, liquid, and gas. In the this phase, which exists mainly at high temperature, matter consists of positively charged ions and free electrons.
Created by: akrafft