a) The centre of an atom is called the ........................................... . b) In the centre of the atom there are two types of sub-atomic particles. These particles are the ........................ and the ....
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a) The centre of an atom is called the ........................................... . b) In the centre of the atom there are two types of sub-atomic particles. These particles are the ........................ and the ........................... . The ............................ are positively charged. The ........................ have no charge. They are neutral. c) The centre of the atom is...................................charged. This is because of the positively charged sub-atomic particles called ..................... . d) Around the centre are negatively charged sub-atomic particles called .................... . e) The overall charge on an atom is zero. Therefore the number of...............................and .......................... are equal. f) The electrons are arranged in energy.........................around the centre of the atom. g) The first energy ...................... is nearest to the centre and can take a maximum of ................ electrons. h) The second and third energy .......................... can take a maximum of .....................electrons each. i) The first .................... level is filled with electrons first and then the....................... and third ones. j) When atoms bond with other atoms, the number of..................... in their outermost energy .................... changes. 2 a) In ionic bonding, electrons from one atom are ...............................to another. b) The charged particles formed are called .................. . c) Negative ions are formed when atoms .................... electrons. d) Positive ions are formed when atoms .....................electrons. e) An example of an ionic compound is .........................chloride. f) ............................ bonds are formed when pairs of electrons are..................... between atoms. g) An example of a .............................. substance is water. h) Diamond is an example of a ......................covalent substance. i) Dots and.....................represent the electrons in these two types of bonding. j) In metals the positively charged metal .............. are arranged in ........................ . k) The .......................... of metal ions are in a ................ of free .High School Of Economics & Finance-AQA C2Science Revision Booklet
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