ChaidiePetris_ENGR 50M_HW1

ENGB SOM HWT DUE : 9/3/23 Ta : . Atomic size decreases 1 - R the number of protons in the nucleus increases -> exert increased positive charge on electrons in same energy level -> attracts electrons more strongly to nucleus => atomic size gets smaller . ii . Atomic size increases . T - B energy levels (shells) are added to atom . Electrons in outern- ost shell are far from nucleus and get weaker attractive forces-> larger atomic size . more e Protons 14 i First ionization energy increases . Increasing nuclear charge => stronger attraction between nucleus and electrons in same energy level => harder to remove an electron . ii . First ionization energy decreases . Addition of energy levels -> outermost electrons are farther from nucleus-> they are shielded by inner electron shells , reducing the effective nuclear charge they experience => they are easier to remove . 1C i Electronegativity increases . L - B atomic sizet and effective nuclear charge => atoms on the R side want more electrons to get a stable electron configuration - -> increasing attraction for electrons L--B = increasing electronegativity . ii Electronegativity decreases . Going down a group , atomic size and effective nuclear charge of outermost electront -> atoms in lower rows are less likely to attract electrons in chem bonds = decreasing electronegativity . 2a Chlorine CI AN=17 Electron config : Is'Isp" p Valence electrons : > Potassium (k) AN=19 Electron config : Is "2s2p"353p1s' Valence electrons : 1 2b Halogens like CIs Alkali metals like I are usually reactive with each other . They have complementary electron configs , So it is mutually beneficial to have reactions . C1 . 7 valence electrons group 17 => needs I more electron to get a stable . complete outer shell (usually 8 electrons) . - highly reactive because it wants that final electron . K . I valence electron , group 1 => highly reactive because it needs to lose I electron to complete a stable outer shell , Halogens like (I and alkali metals like l tend to react when they come into contact . Ex. : (I will take the electron h wants to lose . a transfer that forms k and C1-ions-> KCI ionic compound in which both elements have a stable . full electron config .