The reasons behind this are:
This imparts similar chemical behavior to them.
Yttrium is a chemical element with symbol Y and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a "rare earth element".
Elements arranged in one column exhibit similar chemical properties. Elements in same column also have similar physical properties. Also elements in same column has similar electronic configuration.
Human and animal behavior share some similarities as both are influenced by genetics, instinct, and learned behavior. Both humans and animals engage in social interactions, establish hierarchies, and exhibit emotions such as fear, happiness, and aggression. Additionally, both humans and animals strive for survival and seek resources for sustenance and reproduction.
they termed as lanthanide because the lighter elements in series are chemically similar to lanthanum
Helium, neon, and argon. Also, gadolinium, terbium, dysprosium and many others.
An actinoid is another word for an actinide, one of the fourteen chemical elements positioned under the lanthanides on the periodic table to which they have similar chemistry.
No, I believe it doesn't
Generally, if you look down a group of the periodic table, they all share similar characteristics (groups 1-8). The transition metals and lanthanides and actinides can vary
The chemical behavior of elements is affected by the number and arrangement of electrons in their outermost energy level, known as the valence electrons. Elements with similar valence electron configurations tend to exhibit similar chemical properties. Factors such as atomic size, electronegativity, and ionization energy also play a role in determining the chemical behavior of elements.
Germanium
Lanthanides have properties similar to Cerium
Yttrium is a chemical element with symbol Y and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a "rare earth element".
I would expect all elements in group 1 to have similar chemical behavior to that of sodium, except for hydrogen. Hydrogen is not a metal, but has only 1 valence electron like the other elements in group 1.
lanthanum and other lanthanides
silicon
Elements arranged in one column exhibit similar chemical properties. Elements in same column also have similar physical properties. Also elements in same column has similar electronic configuration.
The electron configurations of the elements in each main group are regular and consistent:the elements in each group have the same number of valence electrons.