They have the same number of protons
all elements in one period have the same number of energy levels
All hydrogen atoms are the same but they are different from the atoms of other elements.
all compounds are formed of one or more elements..
All elements in the groups (excluding transition metals) have the same number of electrons as the group number.
Elements that have similar chemical properties occupy the same group on the Periodic Table.
They are all composed of the same elementary particles, i.e. all of them have protons and electrons (and all but one have neutrons). Also: - all of them have mass - all of them exist in space and time - all of them interact with other elements by means of electromagnetic forces and gravitational forces - all of them exist in more than one isotopic variety.
Elements with the same number of valence electrons are found in the same group or column of the periodic table. This is because elements in the same group have the same number of valence electrons, which determines their chemical properties. For example, all elements in group 1 have 1 valence electron.
Elements in the same group as sodium (Group 1) all contain the same number of outer electrons, which is one. Therefore, there are six elements in the same group as sodium: lithium, potassium, rubidium, cesium, francium, and hydrogen.
All elements are composed of atoms.All atoms of the same elementhave the same mass, and atomsof different elements have different masses.Compounds contain atoms of more than one element.In a particular compound, atoms of different elements aalways combine in the same way.
There is at least one oxidation number shared by all the elements in a periodic table column, but some of the elements may have more than one oxidation number and some of these additional oxidation numbers may not be possible for all the elements in a column.
In the Periodic Table Of Elements, elements are not necessarily similar under the same period. But, they are similar under the same group. they only have one thing in particular they have the same amounts of shells for the atoms
no my dear the elements are not of the same type, and they don't have the same atom number refer to the periodic table and you will see