A GCSE/IGCSE Science-Chemistry word-fill worksheet on ATOMIC STRUCTURE

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Q1(a) Atoms are made of fundamental particles called protons (+), (0) and (-). (b) The centre of the atom is called the . (c) It consists of protons and and contains most of the mass of the atom.

Q2(a) The number of protons in the atom is called the number. It also equals the number of in a neutral atom. (b) The is the sum of the protons and neutrons in the nucleus.

Q3 An atom of mass number 43, and atomic number 21, consists of protons, neutrons and electrons.

doc bQ4 (a) In the symbol for an atom of shown on the left, the atom consists of protons, neutrons and electrons. (b) Atoms of the same element with a different number due to different numbers of neutrons are called .

Q5(a) Electrons are arranged around the nucleus in energy levels or . (b) The 1st shell can have a maximum of electrons, the shell a maximum of electrons and the 3rd shell a maximum of electrons. (c) The 19th and 20th electrons go in the shell. (d) The electron arrangement, showing the number of electrons in each can be written out in shorthand eg 2.8.6 for the 1st, 2nd and 3rd shells respectively.

Q6(a) Apart from hydrogen and in period 1 of the Periodic Table the last number in the arrangement is equal to the number in the Periodic Table. (b) The number of shells used containing electrons is equal to the number. (c) The number of electrons in an atom is equal to the or proton number.

Q7(a) The element has an atomic number of 15 so the atoms have protons or 15 . (b) The electron arrangement will be . (c) In the Periodic Table it will be a member of Group and it will be the element along Period .

Q8(a) Fluorine has an atomic number of so the atoms have 9 protons or electrons. (b) Its electron arrangement is and it belongs to Group on Period .

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