Question

Укажите верные утверждения. 1.периодичность в изменении свойств химических элементов объясняется из Внешнем энергетическом уровне. 2.электроны предпоследнего энергетического уровня называются валентными общее число электронов в атоме можно определить по порядковому номеру xимического элемента. 3.число электронных слоёв в атоме определяется по номеру группы. 4.свойства химических элементов определяется зарядом ядра атома химического элемента.​

Answer 1

Объяснение:

1.периодичность в изменении свойств химических элементов объясняется из Внешнем энергетическом уровне. 3.число электронных слоёв в атоме определяется по номеру группы. 4.свойства химических элементов определяется зарядом ядра атома химического элемента.

Answer 2

Verifying the Statements

Let's verify the statements one by one using search results:

1. The periodicity in the properties of chemical elements is explained by the outer energy level. - This statement is true. The periodicity in the properties of chemical elements is primarily determined by the arrangement of electrons in the outermost energy level, also known as the valence shell. The valence electrons are responsible for the chemical behavior and reactivity of elements. [[1]]

2. The electrons in the penultimate energy level are called valence electrons, and the total number of electrons in an atom can be determined by the atomic number of the chemical element. - This statement is partially true. The electrons in the outermost energy level are called valence electrons, not the penultimate energy level. The valence electrons are involved in chemical bonding and determine the element's chemical properties. The total number of electrons in an atom can be determined by the atomic number of the chemical element, which represents the number of protons in the nucleus. [[2]]

3. The number of electron shells in an atom is determined by the group number. - This statement is false. The number of electron shells in an atom is determined by the period number, not the group number. The period number corresponds to the principal quantum number (n) of the electron shells. The group number indicates the number of valence electrons in the outermost energy level. [[3]]

4. The properties of chemical elements are determined by the charge of the atomic nucleus of the chemical element. - This statement is partially true. The properties of chemical elements are influenced by various factors, including the charge of the atomic nucleus. The number of protons in the nucleus determines the element's atomic number and its position in the periodic table. However, other factors such as electron configuration, atomic radius, and electronegativity also play significant roles in determining the properties of chemical elements. [[4]]

Summary of Statements:

1. The periodicity in the properties of chemical elements is explained by the outer energy level. (True) [[1]] 2. The electrons in the penultimate energy level are called valence electrons, and the total number of electrons in an atom can be determined by the atomic number of the chemical element. (Partially True) [[2]] 3. The number of electron shells in an atom is determined by the group number. (False) [[3]] 4. The properties of chemical elements are determined by the charge of the atomic nucleus of the chemical element. (Partially True) [[4]]

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