Flashcards
chemistry revision
Cards in this deck (25)
- 1what are atoms?protons, electrons and neutrons
- 2what are some of the properties of an element?cannot be broken down
same type of atom
over 100 in periodic table - 3what is a compound2 or more elements chemically combined
- 4what is an atom made up of?nucleus surrounded by electrons
- 5what is the atom nucleus made of and what is its charge?positive charge - made up of neutrons (no charge) and protons (positive charge)
- 6what charge do neutrons have?not charge (neutral)
- 7what charge do protons have?positive
- 8what charge do electrons have?negative
- 9what do the electrons do in an atom?surround the nucleus
- 10how much charge does an atom have?none
- 11there are two numbers associated with the symbol of an element on the periodic table what are they?atomic number and mass number
- 12what is an atomic number?this tells us the number of protons in an atom
- 13what is a mass number?this tells us the number of protons and neutrons in an atom
- 14lithium has a mass number of 7 and a atomic number of 3 so how many protons, electrons and neutrons?3 proton
3 electrons (same as protons to balance charge) 4 neutrons (7-3) - 15what is the atomic mas of a proton electron and neutron?protons and neutrons both have a mass of 1 atomic mass unit (amu)
electrons do not have a mass - 16what are isotopes?they are another from of an element. same atomic number but different mass numbers. Different number of neutrons but the same protons and electrons
- 17how are the electrons formed around the atom?they are in shells
- 18what is the maximum amount of electrons for each shell?1st - 2
2nd - 8
3rd - 8
4th - 18 - 19what is a group on the periodic table?vertical columns - known as group 1 group 2 etc
- 20what do elements in the same group have in common?they have similar chemical properties so they react the in similar ways
- 21how can you tell what group an element is in?the group number is the same as the amount of electrons in the outer shell - 1 electron in the outer shell = group 1
- 22what is a period on the periodic table?the horizontal rows
- 23how can you tell what period a element is in?the amount of shells it has - if it has an electronic structure of 2.8.4 3 shells so in period 3
- 24if the electronic structure of an element is 2.8.3 what is its group and period?group 3
period 3 - 25He - mas number 4 atomic number 2 how many proton electrons and neutrons?2 protons
2 electrons
2 neutrons
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- science (chemistry) Flashcards on chemistry revision , created by anna99watt on 18/04/2014.
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