Based on the periodic table, what do we now call the element mendeleev called eka-manganese?

2 answers:

8 0

Based on the periodic table, the element mendeleev called eka-manganese is now called technetium. Technetium<span> is a silvery-gray metal that tarnishes slowly in moist air. Hope this answers the question. Have a nice day. Feel free to ask more questions.</span>

Keith_Richards [23]3 years ago

6 0

Answer:

Technetium

Explanation:

The Mendeleev element called eka-manganese is now called Technetium.

Technetium is a crystalline, silver and radioactive metal, very similar to platinum. It serves as a gamma ray source of beta particles. Most of the technetium produced on Earth is a byproduct of uranium-235 fission in nuclear reactors and is extracted from nuclear fuel rods. No isotope of technetium has a half-life of more than 4.2 million years, so its detection in 1952 helped reinforce the theory that stars can produce heavier elements.

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The rate constant for a first-order reaction is 0.54 s-1. What is the half-life of this reaction if the initial concentration is

Diano4ka-milaya [45]

Answer:

The half life time of first order reaction is 1.3 sec

Explanation:

Given:

First order rate constant $K = 0.54$ $M^{-1} s^{-1}$