Question

Порядковый номер элемента в периодической системе Д.И. Менделеева указывает на число ... в ядре атома и ... Номер периода в п.с. указывает на число ... в атоме. номер группы в п.с.указывает на число ... и ... хим.элемента.

Answer 1

Порядковый номер элемента в периодической системе Д.И. Менделеева указывает на число протонов в ядре атома и Заряда ядра ...номер периода в п.с. указывает на число электронных слоев в атоме. номер группы в п.с.указывает на число электронов на внешнем электронном слое и валентности хим.элемента.

Answer 2

Element Number and Period Number in the Periodic Table

The ordinal number of an element in the periodic table of Dmitri Mendeleev indicates the number of protons in the atom's nucleus and the atomic number. The period number in the periodic table indicates the number of electron shells in the atom. The group number in the periodic table indicates the number of valence electrons and the chemical properties of the element.

The atomic number of an element is the number of protons in the nucleus of an atom, which determines the element's identity and its place in the periodic table.

The period number in the periodic table indicates the number of electron shells in the atom. Each period represents the energy level of the atom's electron shells. For example, the first period (period 1) contains elements with only one electron shell, the second period (period 2) contains elements with two electron shells, and so on.

The group number in the periodic table indicates the number of valence electrons and the chemical properties of the element. Elements in the same group have the same number of valence electrons and similar chemical properties. For example, Group 1 elements (also known as the alkali metals) have one valence electron and exhibit similar chemical properties.

In summary, the ordinal number of an element in the periodic table indicates the number of protons in the atom's nucleus and the atomic number, the period number indicates the number of electron shells in the atom, and the group number indicates the number of valence electrons and the chemical properties of the element.