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Rb
In the periodic table, the elements are grouped according to their properties. Elements in a group has an equal number of valence electrons. So the elements in a group have most common chemical properties.
The most important principle was the listing in groups, after similar chemical or physical properties.
Magnesium, strontium , and barium belong to group 2A of the periodic table. These have two valence electrons in their outermost shell. So these three elements have similar chemical properties. But the other given elements do not lie in same group so they have different chemical properties.
I guess, the most fundamental is their valency. This dictates how many times it can bond to other elements. Elements with the same valency often share similar properties with other elements with the same valency. The periodic table is divided into 8 rows (and a D block). Each of these 8 rows have elements with similar properties, related to their valencies.
Elements in the same group as cesium
Rb
Buttholes
In the periodic table, the elements are grouped according to their properties. Elements in a group has an equal number of valence electrons. So the elements in a group have most common chemical properties.
sulfur
No other element has the exact same properties as sodium, but the three with the most similar properties would most likely be lithium, potassium, and rubidium.
There is no fully objective answer to this question. Many chemists would consider that two lanthanide elements with atomic numbers differing by only one would be likely to qualify. Another possibility is the pair zirconium and hafnium. These are very similar in most chemical characteristics but differ greatly in electron capture tendencies in nuclear reactors.
1 and 2
Elements in the same group are most similar.
o, s, se
Calcium and potassium
Nitrogen is very similar in chemical properties to Carbon.