I do not uderstand the meaning of Eka - Boron . What is the meaning of Eka?

Answer 1

Well, we owe this term to old Mendeleev......

Well, you know that when Mendeleev initially published the Periodic Table (1869), he was astute enuff to realize that not all of the elements had been characterized or identified. He accounted for apparent gaps in his then Table, by using the prefixes #"eka"#, #"dvi"#, and #"tri"# depending on whether the #"gap"# was one, two, or three rows down from a known element. The prefixes #"eka"#, #"dvi"#, and #"tri"# are #"Sanskrit"# for #"one"#, #"two"#, #"three"#.........
And thus #"eka-silicon"# was one period down from #"silicon"#. The discovery of the element #"germanium"# (1886, soon after old Mendeleev's first published his Table) with precisely the properties predicted for #"eka silicon"# was powerful evidence for the utility and correctness of Mendeleev's periodic approach.

See this site for a (free!) article detailing Periodicity. There is probably much more information here than you need.

Just as a note that you might find amusing, when you read a detective novel, sometimes the crim uses an alias, and the detectives refer to him as #"Joe Blow"# #"also known as"# #"Fred Smith"#; the #"also known as"# part is often abbreviated to #"aka"#, which in these circumstances is apt.........
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Answer 2

In the context of the periodic table, "Eka-Boron" would refer to a hypothetical element that would be directly below boron in the table and have similar chemical properties. "Eka" is a Sanskrit prefix meaning "one" or "first."

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Answer 3

The term "Eka" originates from the Sanskrit language, where it means "one" or "the next one." In the context of the periodic table, the prefix "Eka" was historically used by the Russian chemist Dmitri Mendeleev to denote the predicted properties of elements that had not yet been discovered but were believed to exist based on the periodic patterns of known elements.

For example, Mendeleev predicted the existence and properties of certain elements based on their expected similarities to adjacent elements in the periodic table. He used the prefix "Eka" followed by the name of the known element to denote these predicted elements. When these elements were later discovered and confirmed, they were given their own names.

Specifically, "Eka-Boron" refers to the element that Mendeleev predicted would have similar properties to boron but would have an atomic mass one unit higher. This prediction eventually led to the discovery of the element scandium, which indeed exhibits similarities to boron in certain chemical properties.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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