b. valence electrons
d. electrons needed to fill their octet
Elements with similar physical and chemical properties are located in a group.
The elements in a group have the similar chemical properties dueto presence of same no of electrons in their outermost shell but they differ physically because physical properties are related to their atomic sizes from top to bottom in a group atomic size increases so their physical properties also differ.
Chlorine and Bromine have similar properties. You can tell because they are in the same vertical column in the periodic table.
They all have two valence electrons in their outer energy shell.
because a group of elements in the periodic table behave in a single manner.they have a similar kind of physical properties,i can't surely tell about the chemical properties but in some exceptions these chemical properties are also same.
2 valence electrons (apex)
Because the elements of the column have similar chemical properties and follow trends in the columns
because they have similar properties to the other elements in their groups
These elements have similar chemical and physical properties.
Sulphur and helium have entirely different properties. Sulphur has properties similar to group 16 elements. Helium has properties similar to group 18 elements.
All elements in group 16 share similar properties because their valence shells all contain the s2p4 electron configuration.
Elements in the same group (column) have the same properties. All the elements in group one have similar properties. All the elements in group two have similar properties. And so on...
b. valence electrons d. electrons needed to fill their octet
The elements in the same groups usually do. Elements in the same group have same number of valence electrons and hence have similar chemical and physical properties.
Elements in the same group have similar properties. The groups are made according to the properties of elements. Elements in a group have an equal number of valence electrons.
Elements with similar physical and chemical properties are located in a group.
The elements in a group have the similar chemical properties dueto presence of same no of electrons in their outermost shell but they differ physically because physical properties are related to their atomic sizes from top to bottom in a group atomic size increases so their physical properties also differ.