3. Classify each of the following elements as a noble gas, a representative element, a transition element, or an inner-transition element. Also state whether the element is paramagnetic or diamagnetic: (a) potassium; (b) phosphorous; (c) promethium; (d) platinum; (e) krypton.

Describe and explain each of the following atomic properties of the representative group of elements in the periodic table: (a) The trends of atomic size left-to-right across period and top-to-bottom down the group; (b) The trends of ionization energy left-to-right across period and top-to-bottom down the group

Does any element with Z ≤ 92 match the description? A semimetal in group 5A.

Sagar

28. (a) In Figure P7.7, which sphere could represent a Na atom, Nation, and K atom? Provide an explanation for your choice. (b) In Figure P7.7, which sphere could represent an O atom, S atom, and S2- ion? Provide an explanation for your choice. FIGURE P7.7 (b) (c)

Hypothetical elements X and Y form a molecule XY2, inwhich both Y atoms are bonded to atom X (and not to oneanother). The X—X distance in the elemental form of X is2.04 Å, and the Y—Y distance in elemental Y is 1.68 Å. Whatwould you predict for the X—Y distance in the XY2 molecule?(a) 0.84 Å (b) 1.02 Å (c) 1.86 Å (d) 2.70 Å (e) 3.72 Å

description An element in Period 1 and Group 6A. A metalloid in Group 4A. A halogen with a lower atomic number than nitrogen. A main-group element in Period 4. Does any element with Z≤ 92 match the description? Yes Yes Yes Yes No No No No If you checked yes, give the symbol of an element with Z ≤ 92 that matches. 0 0 0 □

Please refer to the image attached.

Decide which element has the greater size and defend your answer: (i) B or Si; (ii) C or P

Which of the following ions has the smallest size? (a) Cl- (b) Br- (c) Ga^3+ (d) K+ (e) Ca2+