They don't. Of the main group, or representative elements, group 1 elements are the only ones whose atoms have only 1 electron in their outermost energy levels.
The period of an element in the periodic table can be determined by the number of electron shells or energy levels that the element's atoms have. Each period on the periodic table corresponds to the number of electron shells occupied by the elements within that period.
All atoms of a single element have the same number of protons in their nuclei, which defines the element's atomic number. This characteristic gives each element its unique chemical properties. Additionally, while they may vary in the number of neutrons (resulting in different isotopes), the electron configuration, which determines how atoms interact with each other, is also consistent among atoms of the same element.
same number of each element
The period of an element in the periodic table refers to its horizontal row. Each period represents the number of electron shells an element's atoms have.
Elements in a row on the periodic table are called periods. They represent the number of electron shells an element's atoms have. Each period corresponds to the energy level of the electrons in an element's atoms.
each element has one atom of the element's name
Hydrogen is a non metal element. Atomic Mass of it is 1.
In this case, the equation is balanced.
there are atoms inside of each element
It is important to know the relative number of atoms of each element in a compound for the chemical composition.
You can determine the number of atoms of each element in a compound by using the chemical formula of the compound. The subscripts in the formula indicate the number of atoms of each element. For example, in H2O (water), there are 2 hydrogen atoms and 1 oxygen atom.
The chemical formula shows you this. The subscripted number next to each element shows how many atoms are present in a molecule or formula unit. If no number is shown, then only one atom of that element is present.