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Structure of atom

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Teacher Farhanah
Teacher Farhanah

Atom W has 8 protons and 9 neutrons, giving it a nucleon number of 17. Atom Y has the symbol C12. Atom Z has 11 protons and 12 neutrons, with 11 electrons in its electron arrangement and 1 valence electron. Atoms X and W are isotopes because they have the same number of protons but different numbers of neutrons.

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1. Table 1 shows the number of proton, electrons and neutrons for atom W, X, Y and Z. Jadual 1 menunjukkan bilangan proton, elektron dan neutron bagi atom W, X, Y dan Z. Atom Number of protons Bilangan proton Number of neutrons Bilangan neutron W 8 9 X 8 10 Y 12 12 Z 11 12 Table 1 Jadual 1 (a) (i) What is meant by nucleon number? Apakah yang dimaksudkan dengan nombor nukleon? ................................................................................................................ [ 1 mark] (ii) What is the nucleon number of atom W ? Apakah Nombor Nukleon bagi atom W ? .. [ 1 mark] (b) Write the symbol of atom Y in the form of YA Z . Tuliskan simbol bagi atom Y dalam bentuk YA Z . ....................................................................................................................... [ 1 mark] (c) (i) Write the electron arrangement of atom Z. Tuliskan susunan electron bagi atom Z. ............................................................................................................. [ 1 mark] (ii) What is the number of valance electrons in atom Z. Apakah bilangan electron valen bagi atom Z. ............................................................................................................. [ 1 mark] (d) Which atoms are isotopes? Explain why. Atom-atom yang manakah adalah isotop? Jelaskan mengapa. ...................................................................................................................... ...................................................................................................................... [ 2 marks]

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Structure of atom

  • 1. 1. Table 1 shows the number of proton, electrons and neutrons for atom W, X, Y and Z. Jadual 1 menunjukkan bilangan proton, elektron dan neutron bagi atom W, X, Y dan Z. Atom Number of protons Bilangan proton Number of neutrons Bilangan neutron W 8 9 X 8 10 Y 12 12 Z 11 12 Table 1 Jadual 1 (a) (i) What is meant by nucleon number? Apakah yang dimaksudkan dengan nombor nukleon? ................................................................................................................ [ 1 mark] (ii) What is the nucleon number of atom W ? Apakah Nombor Nukleon bagi atom W ? .. [ 1 mark] (b) Write the symbol of atom Y in the form of YA Z . Tuliskan simbol bagi atom Y dalam bentuk YA Z . ....................................................................................................................... [ 1 mark] (c) (i) Write the electron arrangement of atom Z. Tuliskan susunan electron bagi atom Z. ............................................................................................................. [ 1 mark] (ii) What is the number of valance electrons in atom Z. Apakah bilangan electron valen bagi atom Z. ............................................................................................................. [ 1 mark] (d) Which atoms are isotopes? Explain why. Atom-atom yang manakah adalah isotop? Jelaskan mengapa. ...................................................................................................................... ...................................................................................................................... [ 2 marks]