Because the electrons from the outer shell of an atom are the agents of chemical reactions.
The electron shells and the numbers of electrons present in them.
Chemical properties of an element determine by the number of electron
Chemical properties of an element determine by the number of electron
When moving down a group, the number of valence electrons do not change. This similarity yields the elements in the same groups to have same chemical properties. For example, elements in group 17 obtain one electron to stabilize as -1 ion.In a group, all the elements have a same number of valence electrons. So their chemical properties are equal. But the physical properties vary.Valence electrons are the electrons in outermost shell.The valence electrons remain same in a group. For example-Group-1 elements have 1 valence electron.
All the members of a group of elements have similar chemical properties because they all have the same number of electrons in their valence bands. The periodic table of elements is arranged this way, that is, by electron structure. The vertical columns are the groups of elements, and it is their electron structure that places them where they are.
Elements in the same column on the periodic table have similar chemical reactivity because they have the same outer electron configuration and it is the electron structure that determines an elements properties.
all the members of a group of element have similar chemical properties because they all have the same number of electrons in their valence bands.The periodic table of elements is arranged this way,that is,by electron structure. The valence columns are the groups of elements , and is their electron structure that places them where they are.
Group 1 have one valence electron. The elements in Group 2 have two. The elements in Group 17 have seven valence electrons, and Group 18 elements have eight. Because the valence electrons within a family are the same, the elements in that group have similar properties.
There are specific factors that can contribute to a the properties of chemical elements. Some of these factors include the amount of valance electrons in the element.
Atoms are defined by the number of positively charged protons, not negatively charged electrons. Atoms that lose or gain an electron are called Ions. Anion - gained an electron, negative charge Cation - lost an electron, positive charge
Elements in the same group have similar properties because they have the same number of electrons in their outermost shell.
All elements in group 16 share similar properties because their valence shells all contain the s2p4 electron configuration.