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4 years ago

Why does the radius of an atom decrease as you go across (from left to right) a period on the periodic table?

Chemistry

2 answers:

saveliy_v [14]4 years ago

7 0

The most reasonable anwer would be B

Grace [21]4 years ago

3 0

Answer is D) <span>because you are adding positively charged protons, which pull in the outer electrons
</span>
The radius of an atom decreases because the atomic number, or number of protons is increasing. This not only pulls in the outer electrons due to the increasing positive charge, but also increases the mass of the atom, which has the effect of drawing electrons toward the nucleus.

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A rectangle has a length of 5.50m and a width of 12.0m. What is the area of this rectangle?

jolli1 [7]

Answer:

66m

Explanation:

To get the area of something you multiple the length (5.5) by the width (12) together. So the problem would look like 5.5×12 and if you multipe that you get 66

3 0

3 years ago

Help me this 2 . I’m not good at this sorry

emmainna [20.7K]

Left is respiratory

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6 0

3 years ago

In the laboratory you are asked to make a 0.565 m sodium bromide solution using 315 grams of water. How many grams of sodium bro

Scorpion4ik [409]

Answer : The mass of sodium bromide added should be, 18.3 grams.

Explanation :

Molality : It is defined as the number of moles of solute present in kilograms of solvent.

Formula used :

$Molality=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Mass of solvent}}$

Solute is, NaBr and solvent is, water.

Given:

Molality of NaBr = 0.565 mol/kg

Molar mass of NaBr = 103 g/mole

Mass of water = 315 g

Now put all the given values in the above formula, we get:

$0.565mol/kg=\frac{\text{Mass of NaBr}\times 1000}{103g/mole\times 315g}$

$\text{Mass of NaBr}=18.3g$

Thus, the mass of sodium bromide added should be, 18.3 grams.

6 0

3 years ago

What is the definition of an atmosphere? a portion of the electromagnetic spectrum that makes the sky look blue the blanket of g

goldenfox [79]

Answer:

the blanket of gases that surrounds Earth and some other planets

Explanation:

The best definition of the atmosphere is that it is a portion of the earth that is a made up of a blanket of gases.

The atmosphere is not peculiar to the earth alone, some other planets also have atmospheric cover.
The earth's atmosphere is divided into many different layers.
The weather we see and experience on the earth surface is conditioned within the troposphere.
This troposphere is the closest layer to the surface.

7 0

3 years ago

Consider the reaction pathway graph below.

Alex17521 [72]

Hello!

The reaction that the graph represents is A. Exothermic because Hrxn=-167 kJ

To calculate Hrxn we apply the following equation:

$Hrxn=Hproducts-Hreagents=-625kJ-(-458kJ)=-167kJ$

Looking at the graph, and at the result of the calculations, we can see that the enthalpy of the products is lower than the enthalpy of the reagents, because the sign is negative. That means that the reaction releases energy in the form of heat and that the reaction is exothermic.

Have a nice day!

6 0

4 years ago