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Atomic Structure

Chemistry Unit 2

Proton (p) Subatomic particle in nucleus of atom. Mass of 1. POSITIVE (+1) charge. No. of protons in atom = atomic no. of element = no. of electrons in atom. Elements are characterised by having a unique no. of protons and this determines place in periodic table.
Neutron (n) Subatomic particle in nucleus of atom. Mass of 1. NEUTRAL charge. No. of neutrons = atomic mass - atomic number. Isotopes of elements have different no. of neutrons.
Electron (e-) Subatomic particle which ORBITS the nucleus of an atom. Mass of nearly 0 (smallest particle in atom). NEGATIVE (-1) charge. No. of electrons = no. of protons = atomic number as charges cancel each other out.
Mass Number Written at top left of element symbol. Sum of protons and neutrons in nucleus of an atom.
Atomic Number Written on bottom left of element symbol. No. of protons in nucleus of an atom (N.B. also equal to no. of electrons). Elements are characterised by having a unique no. of protons/atomic number and this determines place in periodic table.
Subatomic particle with positive charge Proton
Subatomic particle with neutral charge Neutron
Subatomic particle with negative charge Electron
Particles in the atomic nucleus Protons and neutrons
Subatomic particle with mass of 1 Protons and neutrons
Subatomic particle with mass of nearly 0 Electron
Atomic Structure The structure of an atom which consists of a positively charged nucleus and negatively charged elections orbiting the nucleus
Charge Conserved property of certain subatomic particles that determine their electromagnetic interaction
Isotope A form of chemical element whose atomic nucleus contains a specific number of neutrons, in addition to the unique number of protons that define the element. Isotopes have the same no. of protons but a different no. of neutrons so a different atomic mass.
Nuclear charge Total charge of the protons and neutrons in the atomic nucleus, same value as atomic number, increases as you go along the periodic table.
Nucleus Central part of an atom that contains protons and neutrons.
Subatomic particle Particles that make up an atom; protons, neutrons and electrons
Element Chemically the simplest of substances, consisting of atoms which all have the same number of protons. The no. of protons is unique to an element and determines it's place in the periodic table.
Only element with 0 neutrons in it's commonly known state Hydrogen
Common isotopes of Hydrogen Hydrogen (H1) Deuterium (H2), Tritium (H3) - UNSTABLE
Common isotopes of Chlorine Chlorine Cl 35.5, Cl 35, Cl 37
Common Isotopes of Bromine Bromine Br80, Br79, Br81
Common Isotopes of Carbon Carbon C12, C13, C14 UNSTABLE and radio-active
Atom The smallest object that retains properties of an element. Composed of electrons and a nucleus (containing protons and neutrons). Defining structure of an element.
Created by: bananas20



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