Question

Помогите выбрать два правильных ответа!В ряду химических элементов Si-P-S1) уменьшается атомный радиус2) уменьшается электроотрицательность3) возрастает число валентных электронов4) возрастает число валентных электронов5) уменьшаются кислотные свойства образуемых гидроксидов

Answer 1

1 и 3. В первом точно уверена, а вот в 3 не очень.

Answer 2

The Relationship Between Si, P, and S in Terms of Atomic Radius, Electronegativity, Valence Electrons, and Acidic Properties

To determine the correct answers, let's examine the given statements one by one:

1) "In the series of chemical elements Si-P-S, the atomic radius decreases." 2) "In the series of chemical elements Si-P-S, the electronegativity decreases." 3) "In the series of chemical elements Si-P-S, the number of valence electrons increases." 4) "In the series of chemical elements Si-P-S, the number of valence electrons increases." 5) "In the series of chemical elements Si-P-S, the acidic properties of the formed hydroxides decrease."

Let's analyze each statement and find the correct answers based on the information available.

Atomic Radius:

The atomic radius refers to the size of an atom. It generally decreases as you move across a period (from left to right) in the periodic table. This is due to the increasing positive charge in the nucleus, which attracts the electrons more strongly, resulting in a smaller atomic radius.

Based on this information, we can conclude that statement 1 is correct: "In the series of chemical elements Si-P-S, the atomic radius decreases." [[1]]

Electronegativity:

Electronegativity is a measure of an atom's ability to attract electrons towards itself in a chemical bond. It generally increases as you move across a period (from left to right) in the periodic table. This is because atoms on the right side of the periodic table have a higher effective nuclear charge and a smaller atomic radius, making them more electronegative.

Based on this information, we can conclude that statement 2 is incorrect: "In the series of chemical elements Si-P-S, the electronegativity decreases."

Valence Electrons:

Valence electrons are the electrons in the outermost energy level of an atom. The number of valence electrons determines the chemical properties of an element. In general, the number of valence electrons increases as you move down a group (vertically) in the periodic table.

Based on this information, we can conclude that statement 3 is incorrect: "In the series of chemical elements Si-P-S, the number of valence electrons increases."

Acidic Properties of Hydroxides:

The acidity of hydroxides is determined by the ability of the hydroxide ion (OH-) to donate a proton (H+). In general, the acidity of hydroxides increases as you move across a period (from left to right) in the periodic table. This is because the electronegativity of the elements increases, making it easier for the hydroxide ion to attract and accept a proton.

Based on this information, we can conclude that statement 5 is incorrect: "In the series of chemical elements Si-P-S, the acidic properties of the formed hydroxides decrease."

Summary of Correct Answers:

Based on the analysis above, the correct answers are: 1) "In the series of chemical elements Si-P-S, the atomic radius decreases." 4) "In the series of chemical elements Si-P-S, the number of valence electrons increases."

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