It is an air mass.
Air mass
The chemical properties of calcium are most similar to (in between) the chemical properties of magnesium and strontium.
Phosphorus.
A Nitrogen atom shows the most similar properties to an Oxygen atom.
Selenium.
Oxygen
An air mass
Yes, they have similar chemical properties.
The chemical properties of calcium are most similar to (in between) the chemical properties of magnesium and strontium.
Only caesium has the same properties as caesium. There are other elements which have some similar properties.
Elements in the same family, or group, have similar physical and chemical properties.
Sulphur and helium have entirely different properties. Sulphur has properties similar to group 16 elements. Helium has properties similar to group 18 elements.
They can, however in Groups the properties are much more similar.
Vanadium properties are more similar to titanium.
The lanthanide, or lanthanoid, series. This is a classification on the periodic table characterized by shared properties of these elements, for example, Holmium and Praseodymium have similar properties. Lanthanide is prefered by the public, lanthanoid is preferred by scientists of IUPAC (International Union of Pure and Applied Chemistry).
Nitrogen and phosphorus have the same number of valence electrons (five) and will have similar properties.
Phosphorus.
Halogens have similar properties. All of them form anion.