1. Atom-molekulyar ta’limot. Kimyoning dastlabki tushunchalari. Molekula bu…

43. Tartib nomeri 37 bo’lgan element qaysi davr, qator va guruhga joylashgan? A) V davr, 6-qator, III guruh B) VI davr, 8-qator, III guruh C) V davr, 6-qator, I guruh D) VI davr, 8-qator, IV guruh

44. Davriy sistemada aktinoidlar qanday holatni egallaydi? A) VII davr, III guruh B) VI davr, III guruh C) VI davr, VI guruh D) VII davr, IV guruh

45. Gidrozin molekulasining nisbiy molekulyar massasini toping?

A) 32gr B) 5,315∙10^-23gr C) 34gr D) 32mab
46. Qaysi element gidridining absalyut massasi 5,315∙10^-23 gr ga teng?

A) O₂ B) S C) Si D) C
47. 1 ta elektronning (e^-) massasi 1 ta nuklon massasidan 1840 marta kichikligini bilgan holda elektronning massasini aniqlang.

A) 9,02∙10²⁸ B) 90,2∙10^-29 C) 9,3∙10^-23 D) 6,02∙10²³