Each period of the periodic table ends with:

Answers

Answer 1

Answer:

Each period of the periodic table ends with a noblegas.

What are noble gases?

Noble gas constitutes the seven chemical elements that make up up the eighteenth of the periodictable. The elements comprising the noble gases are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

These noble gases are odorless, colorless, tasteless, and nonflammable gases. Traditionally, they have been labeled as Group 0 in the periodic table was the name given to them for decades after they were discovered. They were named so be they it was believed that they are not able to bond to other atoms.

This meant that there could not combine with the atoms of other elements to form chemicalcompounds. The electronic structures of these structures and the discovery that some of them are able to combine with other atoms to form compounds led them to have a more appropriate name for Group 18.

Therefore each period of the periodic table ends with a noblegas.

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which part of earths interior is inferred to have convection currents that causes tectonic plates to move

Answers

Asthenosphere is inferred to have convection currents that cause tectonic plates to move because the material in this part of the mantle flows and can move plastically and convection is all about the movement of the magma,the hotter stuff rising towards the crust while the cooler stuff sinks deeper into the mantle.

Answer:

Correct answer: B). Global climate is changing due to burning of fossil fuels and deforestation.

Forest holds a large amount of carbon, plants are known to absorb carbon dioxide from the atmosphere as they grow, that carbon dioxide is stored in plants in the form of carbon in plant's roots, leaves and in the soil. When trees are cut down, that stored carbon is released in the environment in the form of carbon dioxide, which accounts for approximately 18% of global greenhouse gas emission.

The burning of fossil fuel like coal, petroleum, oil, gas for the energy purpose is one of the major contributors for the rising level of carbon dioxide in the atmosphere, which leads to global warming and affect the climate.

Hence, the correct answer would be option B.

Explanation:

Which event best helped Becquerel determine uraniun radiates rays ?A)a cloudy day
B)a substance glowing in the dark
C)wrapping of ore in paper
D)exposure of a photographic plate

Answers

Exposure of a photographic plate was the event that best helped Becquerel to determine uranium radiates rays. The correct option in regards to the given question is option "D". Henri Becquerel was a French physicist and he was born on 15th December 1852 and died on 25th August 1908. He was the scientist that discovered radioactivity. In the year 1903, he was awarded with the Nobel Prize for physics for the ground breaking work he did. In the year 1896, Becquerel published seven important papers on his work on radioactivity. This was the work that made him famous around the globe.

Like he said the answer is "D"

After taking a hot shower you may notice that the room gets steamy and the mirror is foggy you might also notice that there is moisture on the walls use these observations to come up with one reason why the temperature of the bathroom increases when you take a hot shower

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Answer:the temperature might increase because of the humidity in the room so everything gets goofy and moist

Explanation:

a hydrogen atom has one proton, two neutrons, and no electrons. Is this atom an ion? Explain your answer.

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An atom is a neutral species. Hence, it must have same number of electrons and protons. On other hand, ions have charge. Hence, number of protons and electrons are not same.

In present case, hydrogen has one proton, two neutrons, and no electrons. This signifies that overall charge of species is +1. Hence, it is an ion.

yes this is an ion because an ion is defined as an element that has gained or lost electrons. There should be 1 electron is Hydrogen but since there aren't any that means that it is an ion which is commonly written as H^+.

The first shell can hold a maximum of two electrons. How does this explain the valence of hydrogen?

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The hydrogen atom has only one electron which is present in the first shell.

We know that first shell can hold a maximum of two electrons so due to incomplete valance shell hydrogen atom is reactive and make covalent bond with other reactive atoms. This bonding will complete its valance shell and finish its reactive nature. In the second shell and other shells can hold 8 electrons so we can conclude that hydrogen has one valance electron.

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What is the mass (in grams) of 4.35 x 10^6 atoms of 12^C atom?

Answers

The mass of 4.35 ×10⁶ atoms of carbon-12 atom is 8.668×10 $^-17$ g.

What is a mole ?

A mole is a standard specific unit prescribed for measuring large quantities of entities which are very small such as atoms, molecules.It represents large number of units that is 6.022×10²³.

It was previously defined as the number which were experimentally determined to be found in 12 grams of carbon-12.Number of atoms in a mole is same for all substances.

Concept of mole provides quantitative information as to what happens in chemical reaction at a macroscopic level.It is used for determination of simplest formula of a compound.

For all practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons.

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$mass = moles * Relative formula massmass = 4.35*10^6/6* 10^23 * 12mass = 8.66... * 10^-17 g$

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