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3 years ago

What are the principles related to absolute, relative, carbon, or radioactive dating

1 answer:

5 0

The atoms of some chemical elements have different forms, called isotopes. These break down over time in a process scientists call radioactive decay. Each original isotope, called the parent, gradually decays to form a new isotope, called the daughter. Each isotope is identified with what is called a ‘mass number’. When ‘parent’ uranium-238 decays, for example, it produces subatomic particles, energy and ‘daughter’ lead-206.

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The process by which molecules of water vapor in the air become liquid water answers

Musya8 [376]

I believe that is condensation

6 0

3 years ago

The sodium isotope with 13 neutrons. Express your answer as an isotope

wariber [46]

Answer:

$\large\boxed{\large\boxed{^{24}_{11}Na}}$

Explanation:

The question is asking to write the <em>isotopic symbol </em>of the form $^A_ZX$ for the <em>sodium isotope with 13 neutrons</em>.

In general, the isotopic symbol in the given form shows:

The element's chemical symbol: X

A: mass number of the isotope, written as a superscript to the left of the element's simbol, and

A = number of protons + number of neutrons

Z: atomic number of the isotope, written as a subscript to the left of the elements's symbol,

Z = number of protons

The atomic symbol of sodium is Na.

The atomic number, or number of protons, is the same for every isotope of the element, and you can find it in any periodic table. Tha atomic number of sodium is 11. Thus:

Z = 11

The mass number is the number of protons plus neutrons, hence:

A = 11 + 13 = 24

Now you can write the isotope symbol for the sodium isotope with 13 neutrons:

$^{24}_{11}Na$

6 0

3 years ago

How many moles of copper are needed to react with sulfur to produce 2.9 moles of copper (I) sulfide

dalvyx [7]

Answer:

5.8 moles of copper are needed to react with sulfur to produce 2.9 moles of copper (I) sulfide.

Explanation:

$2Cu+S\rightarrow Cu_2S$

Moles of copper(I) sufide = 2.9 mol

According to reaction, 1 mole of copper(I) sulfide is obtained from 2 moles of copper, then 2.9 moles of copper(I) sulfide will be obtained from :

$\frac{2}{1}\times 2.9 mol=5.8 mol$ copper

5.8 moles of copper are needed to react with sulfur to produce 2.9 moles of copper (I) sulfide.

4 0

3 years ago

He predicted an element with an atomic weight between 65 (zinc) and 75 (arsenic) with a valence similar to aluminum that he name

skad [1K]

Answer:

Scandium

Explanation:

Mendeleev played an important role in the development of the modern periodic table. His periodic table was filled with gaps. He said that these gaps were elements that were yet to be discovered. He rightly predicted many elements which have now been discovered and fitted in their proper places in the periodic table.

He used the prefix ''eka'' to refer to elements whose properties were alike but were yet to be discovered at that time.

The compound named ekaboron which he predicted to have an atomic weight between 65 (zinc) and 75 (arsenic) with a valence similar to aluminum was later discovered in 1879 and properly named scandium.

3 0

3 years ago

In the final stage of the nuclear fuel cycle, the spent fuel must be transported, processed, and disposed of properly. True Fals

Aleksandr [31]

True
After the process of Ore processing, Enrichment, Fuel production and being passed through the reactor core the last remaining step is spent fuel disposal.

8 0

3 years ago

Read 2 more answers