Question

Can I also get an explanation for the solutions you find? Thanks.

1. Place the following elements in order of increasing radius: B C N Mg Al 2. Place the following elements in order of increasing I1: N 0 Al Si Ga

Answer 1

1. Place the following elements in order of increasing radius: B С N Mg Al Mg В AI с As we move from left to right in period, the size of atom decreases as the effective nuclear charge increas es. B ,C, N in 2nd period and Mg.AI in 3rd period. As the size increases in period Mg Al are large N e toowing n order of inere Al Si Ga Al Ga Si Though Ga is below Al , Aluminium being more metal lic of IIA group possesses lowest 1 Si is smaller than Al, so has higher l1 than Al Amond N and o, N has higher 1 due to the stable half filled 3p3 configuration

3. Antimony (Sb) has two common ions, Sb" and Sb a) Write the ground state electron configuration for antimony, antimony(II), and antimony(V). You should abbreviate the first 36 electrons as "[Kr]" Sb - [Kr] 5s24d105p3 Sb-[Kr 5s2 4d10 Sb - Kr 5s05р0 SB+3 is larger than Sb+5 as it Sbs. has 5orbit also opened. b) Cirele the ion with the larger radius: Sb or 4. Identify the "2+" cation and the "1-" anion that are isoelectronic with helium, then rank these species in terms of increasing radius. Be+2 and H- have 1s2 configurati on, same as He Н- Be+2 He A negative ion has more electrons than protons and thus the electron doud spreads more giveing it larger size A positive ion has more protons than electrons, so the elecrons are strongly pulled inside making it smaller than neutral atom..