Why does atomic radii decrease as you move from the left to right across the period

[tex]\huge \bf༆ Answer ༄[/tex]

The trends showing increase in ionization energy on the periodic table ~

[ due to increase in effective nuclear charge ]

[ Due to decrease in number of shells ]

Ionization energy increases across a period from left to right in the periodic  table.

Ionization energy is the energy needed for the complete removal of valence electrons in its ground state from an isolated atom in its gaseous phase at a specified temperature to form an ion.

Ionization energy shows periodicity in that it shows a regular variation across a period and down a group in the periodic table.

Ionization energy increases across a period from left to right in the periodic  table.

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The mass percentage of sugar in the sweet tea is 10%

From the question,

We are to determine the mass percentage of sugar in the sweet tea

[tex]Mass\ percentage\ of\ sugar\ in\ the\ sweet\ tea = \frac{Mass\ of\ sugar\ in\ the\ solution}{Mass\ of\ the\ solution} \times 100\%[/tex]

Mass of sugar in the solution = 20 g

Mass of the solution = 20g + 180g = 200g

[tex]Mass\ percentage\ of\ sugar\ in\ the\ sweet\ tea = \frac{20}{200} \times 100\%[/tex]

[tex]Mass\ percentage\ of\ sugar\ in\ the\ sweet\ tea = \frac{20}{2} \%[/tex]

∴ Mass percentage of sugar in the sweet tea = 10%

Hence, the mass percentage of sugar in the sweet tea is 10%

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Answer:That all noble gases will have 8 valence electrons which makes a atom stable

Explanation:

Larger molecules take longer to move up the chromatography paper or TLC plate, whereas smaller molecules are more mobile. Likewise, the polarity of the molecules can affect how far the spots travel, depending on the type of solvent used.

[tex]\large\sf\red{♡♡}[/tex]

Answer:

The wavelength is 0.02 m.

Step-by-step explanation:

Given :

To Find :

Using Formula :

Apply Wavelength formula :

[tex]\star{\small{\underline{\boxed{\sf{\purple{\lambda = \dfrac{v}{f}}}}}}}[/tex]

Solution :

Finding the wavelength by substituting the values in the formula :

[tex]{\longrightarrow{\sf{\lambda = \dfrac{v}{f}}}}[/tex]

[tex]{\longrightarrow{\sf{\lambda = \dfrac{12}{600}}}}[/tex]

[tex]{\longrightarrow{\sf{\lambda = \dfrac{\cancel{12}}{\cancel{600}}}}}[/tex]

[tex]{\longrightarrow{\sf{\lambda = \dfrac{2}{100}}}}[/tex]

[tex]{\longrightarrow{\sf{\lambda = \cancel{\dfrac{2}{100}}}}}[/tex]

[tex]{\longrightarrow{\sf{\lambda = 0.02}}}[/tex]

[tex]\star{\underline{\boxed{\tt{\red{\lambda = 0.02 \: m}}}}}[/tex]

Hence, the wavelength is 0.02 m.

[tex]\qquad[/tex][tex] \pink{\bf\longrightarrow { Molar \:mass \:of \:H₂O:-} }[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow 1\times +16[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow 18g[/tex]

[tex]\qquad[/tex]____________________

Let's calculate the number of moles present in 89g of H₂O.

[tex]\qquad[/tex][tex] \purple{\bf\longrightarrow { No \:of \:moles = \dfrac{Given \:mass}{Molar\: mass}}}[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow \dfrac{89}{18}[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow 4.94\: moles[/tex]

We know –

Number of molecules:-

[tex]\qquad[/tex][tex] \purple{\bf \longrightarrow No \: of \: moles \times Avogadro \: number}[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow 4.94×6.022×10²³[/tex]

[tex]\qquad[/tex][tex] \sf \longrightarrow 2.98 ×10²⁴[/tex]

[tex]\qquad[/tex][tex]\purple{ \bf \longrightarrow 2.98×10²⁴ molecules}[/tex]

[tex]\qquad[/tex]____________________

Answer:

The answer is a,b, and c. This is for the USA tesprep videos

Explanation:

The characteristics that apply to the elements in the family are they are highly reactive, they are shiny, soft metals and the element form +1 ions when forming compounds. Thus option a, b and c is correct.  

Main group elements are defined as any of the element belonging to the s and p blocks of the periodic table.

They are most abundant element in universe and on earth.

This elements and their compound are one of the most important economical elements.

They are very good conductor of heat and electricity.

Thus, the characteristics that apply to the elements in the family are they are highly reactive, they are shiny, soft metals and the element form +1 ions when forming compounds. Thus option a, b and c is correct.  

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Answer: Two possible ways to show the structure of CH4 are its electron dot diagram or structural formula. CH4 or methane's molecular formula is given as CH4. The structural formula is a graphical representation of a chemical compound.

Answer:

using electron dot diagrams or structional formula

Atom information–

Substituting values –

[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf A=p^{+}+n^{0}[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf A=26+29[/tex]

[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf A=55[/tex]

____________________________________________

Answer:

I think the answer is A.

Explanation:

hope this helps.

Taking into account the Brønsted-Lowry acid-base theory, a base/conjugate acid pair is H₂O/H₃O⁺.

The Brønsted-Lowry acid-base theory (or the Brønsted-Lowry theory) identifies acids and bases based on whether the species accepts or donates protons or H⁺.

According to this theory, acids are proton donors while bases are proton acceptors. That is, an acid is a species that donates an H⁺ proton while a base is a chemical species that accepts an H⁺ proton from the acid.

So, reactions between acids and bases are H⁺ proton transfer reactions, causing the acid to form its conjugate base and the base to form its conjugated acid by exchanging a proton.

In other words, a conjugate base is an ion or molecule resulting from the acid that loses the proton, while a conjugate acid is an ion or molecule resulting from the base that gains the proton:

acid + base ⇄ conjugate base + conjugate acid

In this case, you know:

H₂PO₄ + H₂O → H₃O⁺ + HPO₄⁻

H₂PO₄ behaves like acid because donates an H⁺ proton while H₂O behaves like base because accepts an H⁺ proton from the acid.

So, H₃O⁺ is the conjugate acid of the H₂O and HPO₄⁻ is conjugate base of H₂PO₄.

In summary,  a base/conjugate acid pair is H₂O/H₃O⁺.

Learn more about the Brønsted-Lowry acid-base theory:

Answer:51.1%

Explanation:

Mass percent : It is defined as the mass of the given component present in the total mass of the compound. Formula used : First we have to calculate the mass of  and . Mass of  = 18 g/mole Mass of  = 7 × 18 g/mole = 126 g/mole Mass of  = 246.47 g/mole Now put all the given values in the above formula, we get the mass percent of  in . Therefore, the mass percent of  in  is, 51.1%

Answer:

Oxygen, heat, and fuel

Explanation:

Oxygen, heat, and fuel are frequently referred to as the "fire triangle." Add in the fourth element, the chemical reaction, and you actually have a fire "tetrahedron." The important thing to remember is: take any of these four things away, and you will not have a fire or the fire will be extinguished.

Cooking any food.

Burning of wood.

Digestion of food.

Acid-base reaction.

Answer:

160.3g

Explanation:

We know the equation:

No of moles = mass ÷ Mass of element

We need to find the mass, so make mass the subject of the formula.

Mass = No. of moles × mass of element

Mass = 5 × 32.06

Mass = 160.3g

Answer:

The atomic numbers of four elements A, B, C, and D are 6,8,10, and 12 respectively. The two elements which can react to form ionic bonds (or ionic compounds) are B (8= 2,6) and D (12 =2,8,2). So D donates its two electrons to B to fulfill their octet.

Explanation:

The greenhouse gases are carbon dioxide, methane, and nitrous oxide.

The greenhouse effect has been defined as the entrapment of the sun's energy by the gases that result in the earth becoming warmer and a better place to live.

The gases present in the atmosphere that has been able to entrap the heat energy has been termed the greenhouse gases.

The greenhouse gases have been carbon dioxide, methane, and nitrous oxide.

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Answer:

carbon dioxide, nitrous oxide, methane

Explanation:

Answer:

15 millimeters

Explanation:

the other answer choices are too large.

Answer:

15 millimeters

Explanation:

The other options are too long.

Answer:

C. Aluminum

Explanation:

Aluminum has 5.9858 ionization energy

Boron has 8.298 ionization energy

Silicon has 8.1517 ionization energy

Carbon has 11.2603 ionization energy

Answer:

As electro-negativity decreases from Florine to downwards in the group and only Florine is above Chlorine, so Florine should react with sodium chloride solution to produce chlorine.  

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Answer:

mezcla homogénea

Answer:

heterogeneous mixture

Explanation:

you can split the mixture easily with you hands while homogeneous mixtures is dissolved

Answer:

13.8 moles

Explanation:

You know that in a mole you have 6.022x10²³ something in this case of molecules. By knowing that by each mole you have 6.022x10²³ molecules, then you can establish the factor of conversion:

8.32x10²⁴molec of CO2 x 1 mol/6.022x10²³ molec of CO2

You divide 8.32x10²⁴/6.022x10²³ and you get 13.81 moles.

Answer:

THE WORK YOU DO ON A MACHINE IS CALLED WORK INPUT

The volume of this same sample of gas if it were measured at STP is 386.09mL

HOW TO CALCULATE VOLUME:

The new volume of a gas sample can be calculated using the following expression:

P1V1/T1 = P2V2/T2

Where;

According to this question, a sample of a certain gas has a volume of 452 mL at 711 mmHg and 26°C (299K).

(711 × 452)/299 = 760 × V2/273

1074.82 = 2.78V2

V2 = 1074.82 ÷ 2.78

V2 = 386.09mL

Therefore, the volume of this same sample of gas if it were measured at STP is 386.09mL.

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The emission spectrum of an atom consists of limited lines that are unique to a given element.

According to the Bohr model of the atom, energy is absorbed or emitted when an atom moves from one energy level to another. Since energy is quantized, the spectrum of atoms often consists of single lines.

Hence, the true statement about atomic spectrum is that; "the light that an element emits is made up of a limited number of narrow lines that produce a unique pattern or atomic emissions spectrum for that element."

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Answer:

Light from the window reflecting off the face of his watch <33

Answer:

The collision theory states that a chemical reaction can only occur between particles when they collide (hit each other).

hope it helps~

Answer:

1. 39.997 g/mol

2. 6.022⋅1023 atoms of aluminium

3. 0.026 moles

4. 14 grams is the molar mass of nitrogen meaning that one mole of nitrogen atoms is 14 grams. One mole of any substance has 6.02*10^23 atoms/molecules of that subtance therefore there are 6.02*10^23 atoms of nitrogen in 14g of nitrogen

5. 78.5

Explanation:

Answer: im pretty sure its D

Explanation: