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Unformatted text preview: 50: Example 2.1 to calculate numbers of protons, neutrons, and electrons. For Positive charge indicates there are more protons than electrons; while the negative charge indicates there are more electrons than protons. This is because neutron does not carry charge, a proton carries one positive charge, and an electron carries one negative charge. The ion in this question carries one negative charge indicating that the electron is one more than the protons. From periodic table, the atomic number (that is, the proton number) of Br is 35, and thus there are 35‐(‐1) = 36 electrons. 9. Which of the following pairs would have similar chemical and physical properties? (a) Ni, Mg (b) H, Na (c) C, Si (d) Cu, Ca (e) Cr, Cl Hint: For 11th ed.: p.p. 48‐50. For 9th edition: p.p. 50‐51. For 10th edition: p. 51. The elements from the same group (i.e. the vertical column) will have similar physical and chemical properties. Be careful that H is a nonmetal while Na is a metal. 10. Which of the following is a molecular compound? (a...
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