Four main-group elements a, b, c and d are highlighted in the outline of the Periodic Table below: a b d List these elements below by increasing ionization energy. For example, if a has the lowest ionization energy and b the next highest, then your list should start a, b, ... Important: don't try to figure out exactly which elements are marked, and then use your knowledge of the properties of each specific element. You don't need to. You will also be marked wrong for any answer, correct or not, that can't be determined from only the rough location of each marked element in the Periodic Table. 1-1-0-1 ×

Calcium metal reacts with cold water as follows: Ca+2H2OCa(OH)2+H2 Magnesium metal does not react with cold water. What behavior toward cold water would you predict for strontium and barium? Write equations to represent any predicted reactions.

Which of the following atoms and ions is (are) isoelectronic with S2+:Si4+,Ar,As3+,Si,Al3+?

Which atom and/or ion is (are) isoelectronic with Br+:Se2+,Se,As,Kr,Ga3+,Cl?

6.84 Which graph correctly depicts the first ionization energy of three elements in groups 14 (dashed line) and 17 (solid line)? Explain the reasoning you used to make your choice.

r Questions 11—13, you will need to consider ionizations beyond the first ionization energy. For example, the second ionization energy is the energy to remove a second electron from an element. Compare the first ionization energy of helium to its second ionization energy, remembering that both electrons come from the 1s orbital. l> X Y First 170 200 second 350 400 Third 1800 3500 fouth 2500 5000 entify the elements X and Y. There may be more than one answer. so explain completely.

Without looking at the figures for the periodic properties, compare the three elements B, AI and C. (a) Place the three elements in order of increasing atomic radius. (b) Rank the elements in order of increasing ionization energy. (c) Which element, B or C, is expected to have the more negative electron attachment enthalpy value?

How are the electron arrangements in a given group (vertical column) of the periodic table related? How is this relationship manifested in the properties of the elements in the given group?

lement X, which has a valence shell configuration of ns2np4 , was isolated in a laboratory. Which of the following statements is(are) true concerning element X? Element X has chemical properties similar to those of the halogens. Element X has six valence electrons. When element X is reacted with calcium, the compound formed would most likely have the formula Ca2X . Element X needs to gain two electrons to attain a noble gas electron configuration. mg src=Images/HTML_99425-11-106AP_image001.jpg alt="" align="top"/>