Question

Why did mendeleev place scandium (sc) differently in the same vertical column.

Answer 1

Mendeleev place scandium (sc) differently in the same vertical column

Explanation:

Mendeleev places scandium(Sc) separately in same vertical column because at that time scandium was not detected, but in 1871, in particular, he pointed to three gaps that fall next to the table elements such as boron, aluminium, and silicon. He labelled the unidentified elements eka-aluminium and eka-baron ("eka" means "one" in the Sanskrit). He also modeled some properties of these missing elements, such as density, boiling point and determination of the elements 'characteristics. Later in a modern periodic table, eka boron was called a scandium.