Question

95 БАЛЛОВ, СРОЧНО!!!! 2 балла По какому признаку элементы размещены в периодической таблице? периодическое изменение теплопроводности уменьшение атомного радиуса уменьшение электроотрицательности повторяющееся изменение свойств Вопрос №2 ? 2 балла Только галогены записаны в варианте I, Cl, Br Br, I, Kr Cl, Br, C F, Cl, S Вопрос №3 ? 2 балла Галоген, агрегатное состояние которого меняется из твердого в газообразный без фазы жидкости это йод бром хлор фтор Вопрос №4 ? 2 балла Какое свойство щелочных металлов делает их неприменимыми в строительстве?"? хрупкость высокая активность высокая стоимость низкая теплопроводность Вопрос №5 ? 2 балла Кроме благородных газов, известно и о благородных металлах. К ним относятся Mg, Ca, Sr Au, Ag, Pt Cu, Zn, Al Fe, Co, Ni Вопрос №6 ? 2 балла Раствор соединения хлора с водородом в воде является сильной кислотой слабой кислотой слабым основанием сильным основанием

Answer 1

1. повторяющееся изменение свойств

2. I, Cl, Br

3. йод

4. высокая активность

5. Au, Ag, Pt

6. сильной кислотой

проверял на тесте школы Альтернативы

Answer 2

Elements in the Periodic Table

The elements in the periodic table are arranged based on repeating patterns of properties, which is known as periodicity. This arrangement allows for the classification and organization of elements based on their atomic structure and chemical behavior. The periodic table is divided into periods (rows) and groups (columns), and elements within the same group often exhibit similar properties.

Periodic Table and the Given Characteristics

Based on the given characteristics, the element arrangement in the periodic table is primarily based on repeating changes in properties. Let's examine each characteristic:

1. Periodic change in thermal conductivity: The thermal conductivity of elements does not follow a specific pattern in the periodic table. While some elements may exhibit periodic changes in thermal conductivity, it is not a defining characteristic for the arrangement of elements in the periodic table.

2. Decrease in atomic radius: The atomic radius generally decreases across a period from left to right in the periodic table. This trend is due to the increasing number of protons in the nucleus, which attracts the electrons more strongly, resulting in a smaller atomic radius.

3. Decrease in electronegativity: Electronegativity refers to an atom's ability to attract electrons towards itself in a chemical bond. In general, electronegativity tends to increase across a period from left to right in the periodic table. This trend is again influenced by the increasing nuclear charge and decreasing atomic radius.

4. Repeating changes in properties: This characteristic refers to the periodicity of properties in the periodic table. Elements within the same group often exhibit similar chemical properties, such as similar reactivity and valence electron configurations. This periodicity is a fundamental aspect of the periodic table.

Based on the given characteristics, the most relevant characteristic for the arrangement of elements in the periodic table is the repeating changes in properties.

Halogens and their Representation

The halogens are a group of elements in the periodic table that include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). In the given options, the correct representation of the halogens is I, Cl, Br.

Changing State of Halogens

Among the halogens, the element whose state changes from solid to gas without passing through a liquid phase is iodine (I). Iodine sublimes directly from a solid to a gas when heated.

Property of Alkali Metals in Construction

The property of alkali metals that makes them unsuitable for use in construction is their high reactivity. Alkali metals, such as lithium (Li), sodium (Na), and potassium (K), are highly reactive and readily react with moisture in the air or water, leading to corrosion and potential safety hazards. Therefore, their use in construction is limited.

Noble Metals

In addition to noble gases, there are also noble metals. Noble metals are a group of metals that are resistant to corrosion and oxidation, making them highly unreactive. The noble metals include gold (Au), silver (Ag), and platinum (Pt). However, the elements magnesium (Mg), calcium (Ca), and strontium (Sr) mentioned in the options are not considered noble metals.

Hydrochloric Acid Solution

The solution of hydrogen chloride (HCl) in water is a strong acid. Hydrochloric acid is a highly corrosive and strong acid commonly used in various industrial and laboratory applications.

I hope this helps! Let me know if you have any further questions.