Cho các nguyên tố Na (Z = 11) và K (Z = 19). a) Viết cấu hình electron nguyên tử và xác định vị trí (ô nguyên tố, chu kì, nhóm).

b) Cho biết mỗi nguyên tố là kim loại hay phi kim? Vì sao. Hãy so sánh tính chất đó (giải thích ngắn gọn).

When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)

Consider the reaction: n2(g) + o2(g) ? 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?

Compare the equilibrium constants for the systems shown in the table. which favors products the most? which favors products the least? rank these systems in order from most to least in terms of favoring products rather than reactants. d > b > a > c c > a > b > d b > c > d > a a > d > c > b