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3 years ago

Which element does not have the same number of electrons in its outermost shell as the other elements in its group?(1 point)

Physics

2 answers:

Setler79 [48]3 years ago

4 0

Helium (He) does not have the same number of valence electrons as other elements in its group.

The periodic table is divided into groups with the last number of the group coinciding with the number of electrons that an element in the group has in its outermost or valence shell.

Helium is in group 18 which means that it should have the same number of valence electrons as :

Neon
Argon
Krypton
Xenon and,
Radon

Yet Helium only has 2 valence electrons. We can therefore conclusively say that Helium does not have the same number of valence electrons as other elements in its group.

More information is available at brainly.com/question/20944279.

artcher [175]3 years ago

4 0

Answer:

The answer is helium (He)

Explanation:

Because helium is in the group 18, and the other elements of group 18 have 8 electrons in it's outermost, while helium just have 2 electrons

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4 years ago

A thermally isolated system consists of a hot piece of aluminum and a cold piece of copper. The aluminum and the copper are in t

RoseWind [281]

Answer:

Explanation:

Make up a question.

The only change is going to be c.

Suppose they aluminum starts our higher at 50oC

Suppose the copper starts out at 20oC

Suppose the mass of both are 25 grams.

Aluminum

m*2c * deltat

deltat = 50 - x
c = 2*c
m = 25

Copper

m*c*deltat

deltat = x - 20

m = 25

c = c

Now since the amount of heat is the same (this starts out on a heated slab of something).

m*2c * (50 - x) = m * c * x - 20 The m and the c are the same. Cancel them out.

2 * (50 - x) = (x - 20) Remove the brackets.

100 - 2x = x - 20 Add 20 to both sides.

120 - 2x = x Add 2x to both sides.

120 = 3x Divide by 3

x = 40

What does this tell you?

It tells you that the temperature of the aluminum is only going to drop 10 degrees

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The heat transfer is actually the same. It doesn't take as much heat to heat copper as it does aluminum. That's shown by the difference in how the temperature changes. One looses 10 degrees. The other gains 20. The transfer is the same because of the way the "c" operates.

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3 years ago

In a simple electric circuit, Ohm's law states that V=IRV=IR, where V is the voltage in volts, I is the current in amperes, and

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To solve this problem, apply the concepts given from Ohm's Law. From there we will obtain the derivative of the function with respect to time and with the previously given values we will proceed to find the change in current as a function of the derivative

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Here

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V = Voltage

R = Resistance

Taking the derivative we will have,

$\frac{dV}{dt} = \frac{dI}{dt}R + I \frac{dR}{dt}$

Our values are given as,

$\frac{dV}{dt} = -0.01$

$\frac{dR}{dt} = 0.04\Omega/s$

$R = 300\Omega$

$I = 0.01A$

Replacing we will have that

$\frac{dV}{dt} = \frac{dI}{dt}R + I \frac{dR}{dt}$

$-0.01 = \frac{dI}{dt}(300\Omega) + (0.01A)(0.04\Omega/s)$

Rearranging to find the current through the time,

$\frac{dI}{dt} = \frac{-0.01- (0.01A)(0.04\Omega/s)}{(400\Omega)}$

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Brut [27]

I don't understand what you mean but whatever

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