Question

ПОМОГИТЕ ПОЖАЛУЙСТА!!! №1 Определите валентность элементов в соединениях: CaCO3; Ba(OH)2; H2S; NaCN; FeS. №2 Какой из элементов обладает более выраженными металлическими свойствами и почему? натрий или цезий №3 Определите: а) место в периодической системе (период, группа, подгруппа) химических элементов; б) строение электронных оболочек; в) является элементом металлом или неметаллом; г) высшую валентность элемента; для элементов с порядковыми номерами: 10; 16; 22; 32; 43

Answer 1

Первая часть, надеюсь почерк поймешь

Answer 2

Valency of Elements in Compounds

1. CaCO3: The valency of calcium (Ca) can be determined by the formula of the compound. In CaCO3, the valency of calcium is 2. 2. Ba(OH)2: The valency of barium (Ba) can be determined by the formula of the compound. In Ba(OH)2, the valency of barium is 2. 3. H2S: The valency of hydrogen (H) and sulfur (S) can be determined by the formula of the compound. In H2S, the valency of hydrogen is 1 and the valency of sulfur is 2. 4. NaCN: The valency of sodium (Na) and carbon (C) can be determined by the formula of the compound. In NaCN, the valency of sodium is 1 and the valency of carbon is 4. 5. FeS: The valency of iron (Fe) and sulfur (S) can be determined by the formula of the compound. In FeS, the valency of iron is 2 and the valency of sulfur is 2.

Metallic Properties of Sodium and Cesium

Sodium and Cesium are both alkali metals and exhibit metallic properties. However, cesium has more pronounced metallic properties compared to sodium. This is due to the fact that as you move down a group in the periodic table, the metallic properties of the elements increase. Cesium being located below sodium in the periodic table exhibits more metallic properties due to its larger atomic size and lower ionization energy.

Characteristics of Elements in the Periodic Table

а) Place in the Periodic Table: The place of an element in the periodic table can be determined by its period and group. The period and group of the elements with the given atomic numbers are as follows: - 10 (Neon): Period 2, Group 18 (Noble Gases) - 16 (Sulfur): Period 3, Group 16 (Chalcogens) - 22 (Titanium): Period 4, Group 4 (Transition Metals) - 32 (Germanium): Period 4, Group 14 (Carbon Group) - 43 (Technetium): Period 5, Group 7 (Transition Metals)

b) Electronic Shell Structure: The electronic shell structure of the elements can be determined by their position in the periodic table and the number of electrons they possess.

c) Metal or Non-metal: The classification of an element as a metal or non-metal can be determined by its position in the periodic table and its properties. For example, elements on the left side of the periodic table are metals, while those on the right side are non-metals.

d) Highest Valency of the Element: The highest valency of an element can be determined by its position in the periodic table and its electron configuration.