Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
CHEMISTRY DEPARTMENT WAID ACADEMY Trends in the Periodic Table 25 The difference in atomic size of sodium and chlorine is mainly due to the difference in the at om . ea of as s 0% ch s. ro fn m be nu nu m be ro fp ro to n tr on s le c ro fe m be 0% eu tr on s. 0% . 0% m number of electrons. number of protons. number of neutrons. mass of each atom. nu 1. 2. 3. 4. 25 In which molecule will the chlorine atom carry a partial positive charge? Cl-Br Cl-Cl Cl-I Cl-F l-F 0% C l-I 0% C l-C l 0% C l-B r 0% C 1. 2. 3. 4. Which description shows the trends in the electronegativity values of elements in the Periodic Table? ... pe ri. . D ec re a a se ac ac ro ss ro s s a pe a In cr ea se ac ro ss se cr ea In pe ri. . ... pe a s ro s ac se 4. 0% 0% 0% 0% re a 3. ec 2. Decrease across a period and increase down a group. Increase across a period and increase down a group. Increase across a period and decrease down a group. Decrease across a period and decrease down a group. D 1. 30 Which of the following chlorides is likely to have the most ionic character? LiCl CsCl BeCl2 CaCl2 aC l2 0% C eC l2 0% B sC l 0% C Cl 0% Li 1. 2. 3. 4. 30 Which equation represents the first ionisation energy of a diatomic element, X2? 1. 2. 3. 4. ½ X2(s) X+(g) + e½ X2(s) + e- X-(g) X(g) X+(g) + eX(g) + e- X-(g) 30 30 Which of the following elements has the greatest electronegativity? Fluorine Caesium Iodine Sodium di um 0% So di n Io si um ae C uo rin 0% e 0% e 0% Fl 1. 2. 3. 4. 30 As the relative atomic mass in the halogens increases the density decreases. the boiling point increases. the first ionisation increases. the atomic size decreases. de at om ic si ze at io n cr ... in ... r.. . on is ti th e fir s e th th e e bo ili de ns ng ity po i de nt in c cr ea se s. 0% 0% 0% 0% th 1. 2. 3. 4. Which of the following elements would require the most energy to convert one mole of gaseous atoms into gaseous ions each carrying two positive charges? Scandium Titanium Vanadium Chromium 0% hr om iu m m di u na Va Ti ta n m di u an 0% C 0% iu m 0% Sc 1. 2. 3. 4. 30 30 On descending the halogen group of the Periodic Table, the 1. attracting power for bonding electrons increases. 2. ionisation energy increases. 3. nuclear charge increases. 4. reactivity increases. se s. re ac t re a iv ity ha rg e rc in c in c re ... in ... er gy cl ea nu ni s io at tra c tin g at io n en po w er fo r.. . 0% 0% 0% 0% Which of the processes represents the second ionisation energy of magnesium? 1. 2. 3. 4. Mg+(g) Mg2+(g) + eMg(g) Mg2+(g) + 2eMg(s) Mg2+(g) + 2eMg+(s) Mg2+(g) + e- 30