Unit 5 Atomic structure

Atom

Atom - the basic unit of all elements

Atomic number

Atomic number - the number of protons in an atom of that element

Electron

Electron - the subatomic particle that moves around the nucleus

Electron diagram

Electron diagram - represents the electronic arrangement of an atom

Electronic arrangement

Electronic arrangement - the way in which electrons are arranged in an atom

Element

Element - a pure chemical substance consisting of a single type of atom which divided into metals, metalloids, and non-metals

Isotope

Isotope - different atoms of an element which have the same number of protons but a different number of neutrons

Mass number

Mass number - the sum of the numbers of protons and neutrons in an atom

Metal

Metal - a class of chemical elements which usually are shiny, have high melting and boiling points, are good conductors of heat and electricity and can be bent or hammered into shape

Metalloid

Metalloid - are elements that have some properties of both metals and non-metals

Neutron

Neutron - the subatomic particle that bears no electrical charge but a mass similar to a proton

Non-metal

Non-metal - a class of chemical elements which usually are dull in appearance if they are solids, have low melting and boiling points and are non-conductors of electricity, poor conductors of heat and brittle

Nucleus

Nucleus - the central part of an atom and contains protons and neutrons with electrons moving around it

Orbit

Orbit - the circular paths in which electrons move around the nucleus in the Bohr's model

Orbital

Orbital - the region in which there is a high probability of finding the electron(s) of an atom

Proton

Proton - the subatomic particle that bears a small positive electrical charge and a mass similar to a neutron

Relative abundance

Relative abundance - the proportion of each isotope in a naturally occurring sample of the element

Relative atomic mass

Relative atomic mass - the weighted average relative isotopic mass of all the naturally occurring isotopes of that element on the 12C = 12.00 scale

Relative isotopic mass

Relative isotopic mass - the relative mass of one atom of that isotope on the 12C =12.00 scale

Shell

Shell - electrons move around the nucleus in circular orbits called shells

Subatomic particle

Subatomic particle - An atom consists of three types of subatomic particles: protons, neutrons and electrons.

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