Viết cấu hình electron nguyên tử và xác định vị trí của nguyên tố trong bảng tuần hoàn các nguyên tố hóa học nếu: a) n = 2; l = 1; ml = +1; ms = - 1/2 b) n = 3; l = 2; ml = 0; ms = - 1/2 c) n + l = 3; ml¬ + ms = 3/2 d) Chu kỳ 4, l = 2 và ml¬ + ms = ½ e) Tổng số e trên các obitan p bằng 15.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

What was bohr’s contribution to the planetary model

Which reason best explains why metals are malleable? a)because they have delocalized electrons b)because they have localized electrons c)because they have ionic bonds d)because they have rigid bonds