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How does neon compare to other elements in its group?
8 electrons in its outmost shell (only helium has two)
How many electrons do the elements of the most stable group have in their outer layer?
Eight, except for helium which has two.
Why is helium normally placed in group 18?
We all know that helium is a noble gas. It has atomic number 2 but it is placed in 18 group be because in 1st group the elements have only one electron in thier s orbital e.g. Hydrogen, lithium, sodium, potassium etc. But helium has two electron so it cannot exist in 1 group. In second group the s orbital are same but the physical and properties of helium is different from the elements present in second group. According to modern periodic table elements which have same physical properties are placed in same group. Since helium is an inert gas and its physical properties are similar to the other elements of the 18 group and also helium discoverd late so that hilium can be put in the 18 group
What elements would be expected to have chemical and physical properties most similar to those of the krypton (Kr)?
Other elements in the same group will have similar chemical and physical properties to krypton. Krypton (Kr) is in group 18 of the periodic table, called the noble gases. Other noble gases, such as neon (Ne) or argon (Ar), will have similar chemical and physical properties to krypton.
Which two letters represent elements in the same group?
Elements in the same group have similar chemical properties. For example, potassium (K) and rubidium (Rb) are in the same group (Group 1) on the periodic table.
