C2 B1 AND B2

ATOMS STRUCTURE

• https://youtu.be/h6LPAwAmnCQ (Einbetten)
• Atom are everywhere,
• Atoms are made of a nucleus that are composed by protons and neutrons and they are surrounded by really fast electrons.
• protons(+)
• electrons(-)
• neutrons(o)
• protons pull electrons in, but the electrons are really fast to compact. neutrons don't have a charge, but why is it important, its important because they keep the atom together.
• protons and electrons got the same number of charges
• 7 atomic mass= number of protons + neutrons
• LI lithium
• 3 atomic number= number proton and electrons
• lithium atomic mass 3 protons, 3 electrons and 4 neutrons
• Bildunterschrift: basic atomic structure and facts

isotopes and electronic configuration

• Isotopes are different atoms of an element with the same number of protons an electrons ,but different numbers of neutrons.
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• this will always tell us how many electrons are in each shell
• Na= sodium =2.8.1 atomic number =11 group number
• the first shell always got 2 electrons and including the second shell and onward they can hold 8 electrons.
• https://youtu.be/EboWeWmh5Pg (Einbetten)

electronic configuration video

• https://youtu.be/hSkJzE2Vz_w (Einbetten)

ions and ionic bonding

• these atoms that have lost or gained electrons in their outer shell
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ionic compunds