who arranged the elements according to atomic mass and used the arrangement to predict the properties of missing elements?

Answers

Answer 1

Answer: Dmitri Mendeleev arranged the elements

Answer 2

Answer:

Final answer:

Dimitri Mendeleev arranged the elements according to atomic mass and predicted the properties of missing elements. His table, known as the periodic table, was later validated and is now widely used in chemistry. The modern version is organized by atomic number and period.

Explanation:

The arrangement of elements according to atomic mass and the prediction of properties of missing elements was conducted by Dimitri Mendeleev in Russia in 1869. Together with Lothar Meyer from Germany, they recognized the periodic relationship among the known elements at that time. However, Mendeleev went a step further to use his table to predict the existence of elements that had properties similar to known ones such as aluminum and silicon.

Mendeleev's predictions were later validated with the discoveries of gallium in 1875 and germanium in 1886. These discoveries lent great credibility to Mendeleev's work. Today, the periodic table is arranged according to atomic number, following the periodic law. This law states that the properties of elements are periodic functions of their atomic numbers.

Importantly, the periodic table is far more than just an arrangement of elements. It's a vital tool in chemistry that helps predict the chemical behavior of elements and compounds.

Learn more about Periodic Table here:

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If the momentum of a car is reduced by half, assuming mass did not change, what must also have been reduced by half?

Answers

Answer:

Velocity is halved

Explanation:

Momentum is contingent on mass and velocity. The quantity of motion in a body is called the momentum of the body.

Momentum = mass x velocity

Now, if mass does not change and momentum is reduced by half, it suggests that the velocity was reduced by half.

Velocity is directly related to momentum.

How does the number of atoms in one mole of argon compare with the number of molecules in one mole of ammonia

Answers

The number of atoms in one molecule of argon is the same as the number of molecules in onemole of Ammonia which is equal to 6.02 × 10²³units.

The Avogadro's number, postulated by italiàn scientist Amedeo Avogadro, is simply defined as the number of units in one mole of any substance (which is defined as the molecular weight in grams), equal to 6.02 × 10²³.

The units may however be electrons, atoms, ions, or molecules, depending on the nature of the substance in discuss.

In this scenario, the number of atoms in onemole of argon is therefore the same as the number of molecules in one mole of Ammonia.

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They are the same because the definition of a mole is 6.022 x 10^23 molecules or atoms based on whether it is a molecule or element. so there are 6.022 x 10^23 atoms of argon in one mole of argon and 6.022 x 10^23 molecules of ammonia in one mole of ammonia

Which explains why the lawsmotion are scientific laws?
O A. The theories of motion became laws after there was enough
evidence to prove they were true.
O B. The laws cannot be tested by experiments, but scientists know
that they are correct because they make sense mathematically.
c. The laws explain how objects move and are supported by
experimental evidence.
O D. The laws describe a wide range of observations of motion and can
be used to predict the motion of objects.
Did

Answers

Answer:

Explanation:

Scientific laws describe how things work with little to no exception. They do NOT provide an explanation to WHY something occurs.

Answer:

The answer is D because scientific laws describe how things work not why they happen.

What structure does a eukaryotic cell have that a prokaryotic cell does not?

Answers

The answer is a Nucleus. Eukaryotic cells have nuclei while;e prokaryotic cells do not.

A yellow luminous flame is produced when an insufficient amount of oxygen is supplied. This flame should not be used when heating because it will coat glassware with black soot. What element is this made from? Answer with the correct elemental symbol. It will be case sensitive.

Answers

Soot is created when burning happens incompletely, because there was an insufficient amount of oxygen supplied. As soot is made from carbon particles, the chemical symbol will be C, for carbon.

What is combined to get calcium chloride