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Chemistry Grade 9 Unit 4: PERIODIC CLASSIFICATION OF ELEMENTS
national exam questions have come from this unit. It runs 25 pages; one careful study pass takes about 2.6 hours, and its difficulty is easier among Chemistry units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.
4.3 The Modern Periodic Table · read p. 116
- 2016 E.C., Q35 – In the modern periodic table, what is the name of the group that contains the most electronegative elements?
- 2016 E.C., Q28 – The electronic configuration of an element in the periodic table is 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 5 . In which block does this element belong?
- 2006 E.C., Q27 – In which region of the Periodic Table would the element with the electronic structure below be located? $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6 4d^6 5s^2$
4.4 The Major Trends in the Periodic Table · read p. 125
- 2018 E.C., Q3 – What is the effect of increasing atomic size on electronegativity down a group of periodic table?
- 2017 E.C., Q70 – Which statement below CORRECTLY describes periodicity? Periodicity is
- 2016 E.C., Q36 – A given element has atomic number of 55 and mass number of 133. Which of the following describes CORRECTLY the property of this element?
- 2014 E.C., Q20 – What does Mendeleev's Periodic Law state? Properties of elements are
- 2013 E.C., Q46 – In the modern periodic table
- 2012 E.C., Q26 – Which of the following is the correct increasing order of the atomic size of Mg+, Na, Si^3+, and Al^2+?
- 2012 E.C., Q38 – For the reaction: C2H4(g) + H2(g) → C2H6(g), ΔH = -137 kJ. Which statement about the information is correct?
- 2010 E.C., Q28 – Which of the following statements about oxygen and fluorine is NOT correct?
- 2008 E.C., Q8 – Which of the following statements is not true about covalent bonding?
- 2006 E.C., Q46 – Which statement about the following reaction is correct?