The smallest particle of an element that can be identified with that element. Consists of protons and neutron in the nucleus, and is surrounded by electrons. Building blocks of matter.a
A substance made of only one kind of atom. Examples of elements are carbon, hydrogen, oxygen, and nitrogen.
The perpetual random movement of microscopic particle suspended in a fluid medium.
The smallest particle of substance consisting of two or more atoms of the same or different elements bonded together.
A chemical substance made of atoms of two or more different elements combined in a fixed proportion.
A description that uses numbers and symbols of elements to describe the proportions of elements in a compound or reaction.
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 tine fraction of the volume.
The principle building blocks of the nucleus; a proton or neutron.
An electrically neutral particle that is one of the two kinds of particles found in the nucleus of an atom.
Positive charged particle that is one of the two kinds of particles found in the nucleus of an atom.
A form of an elements having a particular number of neutron in the nuclei of its atoms. Different isotopes of a particular element have same atomic number but different atom mass numbers.
The number of protons in the nucleus of an atom
An atom (or groups of atoms together) with a net charge, which is due to the loss or gain of electrons.
Shell model of the Atom
A model in which the electron of an atom are picture as grouped in concentric shells around the nucleus.
A chart that lists elements by atomic number and by electron arrangements, so that elements with similar chemical properties are in the same column.
In addition to solid, liquid, and gas. In the plasma phase which exists mainly at high temperature, matter consists of positively charged ions and free electrons.
5 Life Making Elements
Oxygen, Carbon, Hydrogen, Nitrogen, and Calcium.
Most abundant in the universe.
Fusion Reaction in Stars
Create most of the natural elements.
23% of the matter in the universe is composed of this.
Atoms cannot be seen with visible light because they are smaller than the wavelengths of light.
4.6 Billion Years Ago
Atoms in your body have been around since long before the solar system about 4.6 Billion years ago.
Two "Picture" Devises
An electron microscope and a scanning tunneling microscope help "picture" atoms.
Metals and Crystalline Minerals
Are made of atoms not joined in molecules.
Gasses and Liquids
At room temperature are usually made of molecules.
Alike nucleons attract(Protons and Protons or Electrons and Electrons). Different nucleons attract (Electron and Protons).
Atom with a net charge is an ion.
Metals and Non-Metals
Metals are located on the left of the Period Table of Elements, while the non-Metals are on the right.
Four Phases of Matter
Solids, Liquids, Gaseous, and Plasma.
Amount of Elements
115 elements exist, 90 are occur naturally, the rest are man-made in laboratories.